Announcement

**claydoh** · Apr 28, 2026, 01:26 AM

Originally posted by JoshiFresa View Post

I installed ffmulticonverter in Kubuntu kernel 26.04 using those advised commands

sudo add-apt-repository ppa:ffmulticonverter/stable
sudo apt-get update
sudo apt-get install ffmulticonverter

How is that even possible? There is no way to install the at best 12-year-old packages from there in 26.04. there is no 26.04 (resolute) reposiotory there.

Your PPA does not provide any packages for 26.04.

And the noobslab PPA you added is also truly ancient and dead, last used in 2018. Only look at how-tos that are specific to your exact *buntu release, and as recent as you can find.
https://launchpad.net/~noobslab/+archive/ubuntu/apps

Same for the old and dead ffmulticonverter
https://launchpad.net/~ffmulticonver.../ubuntu/stable

Originally posted by JoshiFresa View Post

After that I tried to throw the directory containing the app to the trash but it did not let me do so. I was surprised but I forced trashed it though.

I have no idea what you mean here.

But, since you added the PPA, which was already dead and never provided any software to you, the PPA removal commands don't know what to do.

However, all you need to do here is find the correct file referencing noobslab in /etc/apt/sources.list.d/ and delete it.

Originally posted by JoshiFresa View Post

Modify the PPA entry in the sources.list file:
sudo sed -i 's/noble/focal/g' /etc/apt/sources.list.d/xyz-ubuntu-ppa-noble.list

No, just no, do not follow any random things you find on random websites. Seriously.

Just stick with apps you find in Discover, until you learn a bit more about how things work.

**JoshiFresa** · Apr 28, 2026, 03:09 AM

Originally posted by claydoh View Post

How is that even possible? There is no way to install the at best 12-year-old packages from there in 26.04. there is no 26.04 (resolute) reposiotory there.

Your PPA does not provide any packages for 26.04.

And the noobslab PPA you added is also truly ancient and dead, last used in 2018. Only look at how-tos that are specific to your exact *buntu release, and as recent as you can find.
https://launchpad.net/~noobslab/+archive/ubuntu/apps

Same for the old and dead ffmulticonverter
https://launchpad.net/~ffmulticonver.../ubuntu/stable

I have no idea what you mean here.

But, since you added the PPA, which was already dead and never provided any software to you, the PPA removal commands don't know what to do.

However, all you need to do here is find the correct file referencing noobslab in /etc/apt/sources.list.d/ and delete it.

No, just no, do not follow any random things you find on random websites. Seriously.

Just stick with apps you find in Discover, until you learn a bit more about how things work.

I'm a beginner in Linux. I wasn't aware that if an app is old it can even cause an issue to the system. In Windows if an app is too old, it usually does not even let you install it, with some dialog box popping up, so you don't get into trouble to start with. Now I'm also learning that a PPA has to have "packages" to install in a given distro or kernel. That helps to understand the error. And so I did not execute the command from this random site and instead asking here for help as stated above. You're mentioning to remove the correct file referencing noobslab in etc/apt/sources.list.d to delete it but I need more help to do just that, since what I see in this folder does not really mention noobslab. I'll add a screenshot to show what I see. I don't know what I'm supposed to see there and what this directory is about, how to remove it, or if it will give me permissions to do so.

**JoshiFresa** · Apr 28, 2026, 03:11 AM

What I see in the sources.list.d folder

Attached Files

**claydoh** · Apr 28, 2026, 04:53 AM

Moving to the correct subforum.

So this is an upgrade, then? From which release?
Maybe a little more specific info on what you have done here, specific commands, actions, and webpages, if you can.

That first file you must have created or edited in some fashion.

So post the contents of this, as well as the ubuntu.sources file.
Also post the contents of /etc/apt/sources.list if it has any URLs in it.

We are looking for reference to the url in your error messages. Normally, adding a PPA creates its own file, which is easier to manage, and doesn't damage or mess up your standard sources.

**Schwarzer Kater** · Apr 28, 2026, 05:24 AM

Slightly OT first, because it is important:

Originally posted by claydoh View Post

[…]
No, just no, do not follow any random things you find on random websites. Seriously.
[…]

You shouldn't do something like this in any operating system - one cannot stress this enough!

The only exception IMHO: you cannot install this specific software from your operating system's "software store",
a) you know that the website/the author of the program is trustworthy and
b) the software is intended for your operating system and the version of you operating system.

Otherwise "all bets are off" and - worst case - anything could happen (also in Windows which is not different at all in this regard - you can't imagine how many botched Windows systems I have seen in the last 30 years, because people have installed something they found on some website or gotten from a friend…).

You wouldn't try to install brake pads (from an untrustworthy dealer) for a 2015 Nissan Leaf in a 2020 Ford F150, would you?

If you cannot find a specific software in a "software store", in Linux you also have the good possibilities to additionally use the Snap Store or Flatpaks from Flathub.
But the same applies there: don't install anything that is not trustworthy, meaning verified by The Snap Store or by Flathub!

Back to your problem:

The only thing I can see in your output where the error could possibly come from is moved-from-main.sources - you could paste cat /etc/apt/sources.list.d/moved-from-main.sources here. And please use <CODE> tags.

By the way: there is a typing error in sudo add-apt-repository --remove ppa:nooblap/apps/ in your first post.

PS: Sorry for the delay / that I had not seen claydoh's post in time - I had to cook lunch while I was occasionally typing…

**JoshiFresa** · Apr 28, 2026, 08:24 PM

Okay thanks guys,

I use Kubuntu 26.04 as an update from Kubuntu 24.06

I downloaded the app at sourceforge naively believing that sourceforge should be a serious place to get an app since it's publicly exposed like github. ok

https://sourceforge.net/projects/ffmulticonv/

Then I unzipped and looked at the info file to install:

Installation
-------------
From application's directory run as root:
python3 setup.py install

Uninstall
----------
Run the uninstall.sh script as root to delete all project files from your
system.

So I used:

python3 setup.py install

And as it didn't seem to work I used:

sudo add-apt-repository ppa:ffmulticonverter/stable
sudo apt-get update
sudo apt-get install ffmulticonverter

Then as it did not seem to work I decided to uninstall the app to learn by trial and error.
I could not do it with this:

uninstall.sh

Then I used commands to probably make you probably jump up guys:

sudo add-apt-repository ppa:ffmulticonverter/stable
sudo apt-get update
sudo apt-get install ffmulticonverter

I thought erroneously that I was over with it and proceeded to send to trash the downloaded/extracted files (folder) of the app itself but it refused to be trashed because some elements in it were still active.

So I understood that my general feeling of having some trouble was confirmed and soon came an error message in Discover and in the Terminal with sudo apt update.

[sudo: authenticate] Password:
Hit:1 http://archive.ubuntu.com/ubuntu resolute InRelease
Get:2 http://security.ubuntu.com/ubuntu resolute-security InRelease [136 kB]
Get:3 http://archive.ubuntu.com/ubuntu resolute-updates InRelease [136 kB]
Ign:4 https://ppa.launchpadcontent.net/noobslab/apps/ubuntu resolute InRelease
Err:5 https://ppa.launchpadcontent.net/noobslab/apps/ubuntu resolute Release
404 Not Found [IP: 185.125.190.80 443]
Get:6 http://security.ubuntu.com/ubuntu resolute-security/main amd64 Packages [12.4 kB]
Hit:7 http://archive.ubuntu.com/ubuntu resolute-backports InRelease
Get:8 http://security.ubuntu.com/ubuntu resolute-security/main i386 Packages [3,796 B]
Get:9 http://security.ubuntu.com/ubuntu resolute-security/main Translation-en [6,592 B]
Get:10 http://security.ubuntu.com/ubuntu resolute-security/main amd64 c-n-f Metadata [632 B]
Get:11 http://archive.ubuntu.com/ubuntu resolute-updates/main amd64 Packages [12.4 kB]
Get:12 http://archive.ubuntu.com/ubuntu resolute-updates/main i386 Packages [3,796 B]
Get:13 http://archive.ubuntu.com/ubuntu resolute-updates/main Translation-en [6,592 B]
Get:14 http://archive.ubuntu.com/ubuntu resolute-updates/main amd64 c-n-f Metadata [628 B]
Reading package lists... Done
E: The repository 'https://ppa.launchpadcontent.net/noobslab/apps/ubuntu resolute Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Missing Signed-By in the sources.list(5) entry for 'https://ppa.launchpadcontent.net/noobslab/apps/ubuntu'

I did not used this because I don't understand it

Modify the PPA entry in the sources.list file:
sudo sed -i 's/noble/focal/g' /etc/apt/sources.list.d/xyz-ubuntu-ppa-noble.list

But it helped me to see where the filecat /etc/apt/sources.list.d/moved-from-main.sourcess are stored when such a program is installed.

Usually I only use Discover to install any app but this time was the only exception. I also forgot to check that the app is very old. That's true. Next time I'll know to avoid this kind of installation or I will ask for advice before causing.

Now you ask for more info here is what reads in etc/apt/source.list.save

## See sources.list(5) for more information, especialy
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.
# deb https://ppa.launchpadcontent.net/noobslab/apps/ubuntu resolute resolute Release
deb-src https://ppa.launchpadcontent.net/noobslab/apps/ubuntu resolute resolute Release

This is what I find in /etc/apt/sources.list.d/ moved-from-main.sources using the Terminal

cat /etc/apt/sources.list.d/moved-from-main.sources:

# Modernized from /etc/apt/sources.list
Types: deb deb-src
URIs: https://ppa.launchpadcontent.net/noobslab/apps/ubuntu/
Suites: resolute
Components: resolute Release
Signed-By:

Other files don't seem to have anything related to noobslab. I'll use the advice a) and b) of Black kitten in the future. Sorry I still don't know how to use the <code> tags in a forum, I mean which ones. It's the first time in my life I subscribed to a forum for help.

**Schwarzer Kater** · Apr 29, 2026, 02:23 AM

A simple sudo rm /etc/apt/sources.list.d/moved-from-main.sources should do then to get rid of it. Anything else that does not end in .list or .sources is ignored anyway.

So sudo apt update && sudo apt full-upgrade should work afterwards.

To wrap CODE tags around a text:

click "Toggle advanced editor"

select the text and click this.

Note the instructions at the top of the forum page (light yellow).

Code:

Things you have copied
from Konsole are much
easier to read now.

**Schwarzer Kater** · Apr 29, 2026, 02:39 AM

OT:

Originally posted by JoshiFresa View Post

[…]
I downloaded the app at sourceforge naively believing that sourceforge should be a serious place to get an app since it's publicly exposed like github.
[…]

Well, anybody could post something on sourceforge, couldn't they? Also a malicious actor as it is called by the IT security guys and girls.
(I think nowadays it is better to be a bit too paranoid instead of too trusting concerning the internet - at least it's about your personal data and on a production system it could be about your livelihood.)

I don't say that the author of the program is one.
But the last upload of the program is ten years old - so it very probably has not been tested with/been written for *Ubuntu 26.04. At least *Ubuntu 26.04 is not mentioned anywhere and the homepage of the author is a (broken?) google web page…

**claydoh** · Apr 29, 2026, 03:03 AM

What are the contents of /etc/atp/sources.list.d/ubuntu.sources <-- NOT the one ending with "saved" This is your main source file. The important one. We will check this just to be safe.
As well as the content of /etc/atp/sources.list, again, just to be safe. This is the old legacy place to put apt sources, but we want to make sure nothing is wrong with it.

Delete the file /etc/apt/sources.list.d/moved-from-main.sources
Delete the file /etc/apt/source.list.save <--- OPTIONAL, you don't need it, but it also is not being read, so it isn't hurting anything.

**JoshiFresa** · Apr 29, 2026, 04:03 AM

This is the result after using the command, working fine:

Code:

sudo apt update && sudo apt full-upgrade
Hit:1 http://security.ubuntu.com/ubuntu resolute-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu resolute InRelease
Hit:3 http://archive.ubuntu.com/ubuntu resolute-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu resolute-backports InRelease
3 packages can be upgraded. Run 'apt list --upgradable' to see them.
The following packages were automatically installed and are no longer required:
  libdbus-glib-1-2     libqt5opengl5t64       python3-gpg             python3-pyside6.qtgui
  libpyside6-py3-6.10  libshiboken6-py3-6.10  python3-pyside6.qtcore  python3-pyside6.qtwidgets
Use 'sudo apt autoremove' to remove them.

Upgrading:
  jq  libjq1  python3-tornado

Summary:
  Upgrading: 3, Installing: 0, Removing: 0, Not Upgrading: 0
3 standard LTS security updates
  Download size: 525 kB
  Space needed: 8,192 B / 375 GB available

Continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu resolute-updates/main amd64 jq amd64 1.8.1-4ubuntu2 [72.4 kB]
Get:2 http://archive.ubuntu.com/ubuntu resolute-updates/main amd64 libjq1 amd64 1.8.1-4ubuntu2 [146 kB]
Get:3 http://archive.ubuntu.com/ubuntu resolute-updates/main amd64 python3-tornado amd64 6.5.4-0.1ubuntu0.1 [306 kB]
Fetched 525 kB in 2s (309 kB/s)          
(Reading database… 275713 files and directories currently installed.)
Preparing to unpack …/jq_1.8.1-4ubuntu2_amd64.deb…
Unpacking jq (1.8.1-4ubuntu2) over (1.8.1-4ubuntu1)…
Preparing to unpack …/libjq1_1.8.1-4ubuntu2_amd64.deb…
Unpacking libjq1:amd64 (1.8.1-4ubuntu2) over (1.8.1-4ubuntu1)…
Preparing to unpack …/python3-tornado_6.5.4-0.1ubuntu0.1_amd64.deb…
Unpacking python3-tornado (6.5.4-0.1ubuntu0.1) over (6.5.4-0.1)…
Setting up python3-tornado (6.5.4-0.1ubuntu0.1)…
Setting up libjq1:amd64 (1.8.1-4ubuntu2)…
Setting up jq (1.8.1-4ubuntu2)…
Processing triggers for man-db (2.13.1-1build1)…
Processing triggers for libc-bin (2.43-2ubuntu2)…

Thanks a lot Schwarzer kater for the advice, the help to get started with the code and the working command!

**JoshiFresa** · Apr 29, 2026, 04:31 AM

Originally posted by claydoh View Post

What are the contents of /etc/atp/sources.list.d/ubuntu.sources <-- NOT the one ending with "saved" This is your main source file. The important one. We will check this just to be safe.
As well as the content of /etc/atp/sources.list, again, just to be safe. This is the old legacy place to put apt sources, but we want to make sure nothing is wrong with it.

Delete the file /etc/apt/sources.list.d/moved-from-main.sources
Delete the file /etc/apt/source.list.save <--- OPTIONAL, you don't need it, but it also is not being read, so it isn't hurting anything.

1. Here is what is found in the ubuntu sources file:

Code:

# Automatically generated by Calamares on 2026-04-06.
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of Kubuntu.
## Ubuntu distribution repository
##
## The following settings can be adjusted to configure which packages to use from Ubuntu.
## Mirror your choices (except for URIs and Suites) in the security section below to
## ensure timely security updates.
##
## Types: Append deb-src to enable the fetching of source package.
## URIs: A URL to the repository (you may add multiple URLs)
## Suites: The following additional suites can be configured
## <name>-updates - Major bug fix updates produced after the final release of the
## distribution.
## <name>-backports - software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
## Components: Aside from main, the following components can be added to the list
## restricted - Software that may not be under a free license, or protected by patents.
## universe - Community maintained packages.
## Software from this repository is only maintained and supported by Canonical
## for machines with Ubuntu Pro subscriptions. Without Ubuntu Pro, the Ubuntu
## community provides best-effort security maintenance.
## multiverse - Community maintained of restricted. Software from this repository is
## ENTIRELY UNSUPPORTED by the Ubuntu team, and may not be under a free
## licence. Please satisfy yourself as to your rights to use the software.
## Also, please note that software in multiverse WILL NOT receive any
## review or updates from the Ubuntu security team.
##
## See the sources.list(5) manual page for further settings.
Types: deb
URIs: http://archive.ubuntu.com/ubuntu
Suites: resolute resolute-updates
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

## Ubuntu security updates. Aside from URIs and Suites,
## this should mirror your choices in the previous section.
Types: deb
URIs: http://security.ubuntu.com/ubuntu/
Suites: resolute-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

Types: deb
URIs: http://archive.ubuntu.com/ubuntu
Suites: resolute-backports
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

2. I cannot find such file as /etc/atp/sources.list

3. /etc/apt/sources.list.d/moved-from-main.sources was already removed by Black Kitty's command above

4. I found out that /etc/apt/source.list.save is in fact /etc/apt/sources.list.save (source with an "s"). I removed it with command sudo rm /etc/apt/sources.list.save

RESULT:

Code:

sudo apt update && sudo apt full-upgrade
Hit:1 http://security.ubuntu.com/ubuntu resolute-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu resolute InRelease
Hit:3 http://archive.ubuntu.com/ubuntu resolute-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu resolute-backports InRelease
All packages are up to date.
The following packages were automatically installed and are no longer required:
libdbus-glib-1-2 libqt5opengl5t64 python3-gpg python3-pyside6.qtgui
libpyside6-py3-6.10 libshiboken6-py3-6.10 python3-pyside6.qtcore python3-pyside6.qtwidgets
Use 'sudo apt autoremove' to remove them.

Summary:
Upgrading: 0, Installing: 0, Removing: 0, Not Upgrading: 0

Thanks for all the help Claydoh, working fine!

**claydoh** · Apr 29, 2026, 04:45 AM

Originally posted by JoshiFresa View Post

/etc/atp/sources.list

oops that is apt , Corrected

Apologies!

I *think* you are OK, but double checking the file just to be safe here.

**JoshiFresa** · Apr 29, 2026, 05:05 AM

Originally posted by claydoh View Post

oops that is apt , Corrected

Apologies!

I *think* you are OK, but double checking the file just to be safe here.

No worries I noticed the typos so it did not affect anything. The /etc/apt/sources.list file is nowhere to be found.

**claydoh** · Apr 29, 2026, 05:18 AM

Odd, but also harmless. As it is a legacy file it is not normally used any longer, but is still supported. So there won't be any odd or broken sources there, if it does not exist

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ubuntu resolute Release does not have a Release file

ubuntu resolute Release does not have a Release file

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