Kubuntu Forums - Current Supported Releases

[Software]Java app forbidden to run. Why, and how do I regain control of what apps are allowed to run on my kubuntu desktop?

DinoNerd — Sun, 08 Nov 2026 23:55:35 GMT

I upgraded from 25.10 to 26.04 LTS some months ago.

While on 25.10, I installed and ran a java app. It ran, but not usefully, because it couldn't handle Wayland's fractional scaling, which was set up on this system by the default Kubuntu installer. My research failed to find a solution to the problem beyond "wait a few years", so I chose to use the app on an elderly Macintosh, where I didn't have to contend with Wayland.

When 26.04 LTS came out, I upgraded the system to it, but didn't attempt to run the problem app.

Months later, an online discussion suggested to me that this toggle on the Display and Monitor section of the System Settings App might solve the problem, by interposing XWayland between the app and Wayland itself.

Today I tried it, then launched the app from the command line.

I got this:

As you can see, there's no explanation of the security problem or any identification of the piece of software whose authors have determined that Kubuntu users are to be forbidden to use java, or perhaps this app, or perhaps just whatever version of java I have installed.

Given that all the .debs on my system get upgraded at the same time, the "insecure" java is presumably the same release/bug fix generation as this vigilant if uncommunicative sentry, protecting me from risks it doesn't care to explain.

Or maybe not - part of kubuntu comes as snaps, rather than .debs, and since I've no clue what software issued this message, I can hardly guess how its distributed.

--
I'm feeling very cranky right now. I have strategies I can use to identify the blocker, and maybe even find out what the undescribed security issue might be.

But I don't want to apply them as much as I want to find whoever broke my system by implementing this, and yell at them for the next several hours.

I'd also like to know how this got onto my system. Apple has a back door whereby they can push what they consider to be urgent security fixes onto internet-connected Macs that are refusing OS and app updates. It's not clear whether the user will even know they've had their software changed. Does Kubuntu have something similar?

Or did I get this via (a) upgrading to 26.04 or (b) doing "sudo apt full-upgrade" ?

[Post-Install]GUI frezes for a few seconds when installing a DEB

vanadiumboy — Sun, 08 Nov 2026 00:45:22 GMT

Hello all,
Sometimes, I install an app using a DEB file.
For example, I install LibreOffice, I install VirtualBox (virtualbox-7.2_7.2.8-173730~Ubuntu~noble_amd64.deb)

Is it just me or that does the GUI hang sometimes for 1 s, 5 s, 40 s and such. The mouse doesn't move during these hands.
I play video using Firefox and the video hangs but the sound plays.

It is as if I have 1 core CPU.

================
But, when I do updates using Discover, the GUI seems to be fine.

I have a Ryzen 5 3600 3.6 GHz, 6c/12t
AMD Radeon RX6800 16 GB
I have enough RAM, lot of free space. I have 24 GB DDR4 3200 MHz.

[Desktop]Discover Hangs Downloading Firefox Update along with snapd Update

life0riley — Thu, 05 Nov 2026 14:48:12 GMT

Discover hung for some time today downloading Firefox.
I took the following steps to move forward and take updates.
I clicked Cancel in Discover to stop the process. There was no change, so I clicked the x to close Discover.
Then I opened a terminal and typed 'sudo snap refresh' and I was able to take the updates.

Code:

$ sudo snap refresh
[sudo: authenticate] Password:
2026-11-05T05:39:23-08:00 INFO Waiting for automatic snapd restart...
2026-11-05T05:39:24-08:00 INFO Waiting for automatic snapd restart...
2026-11-05T05:39:25-08:00 INFO Waiting for automatic snapd restart...
2026-11-05T05:39:26-08:00 INFO Waiting for automatic snapd restart...
snapd 2.78 from Canonical✓ refreshed
firefox 159.0.1-1 from Mozilla✓ refreshed
$

I thought I remember someone saying this was resolved for KDE 6.7, but maybe that was only for Neon. In the mean time updating from the terminal works.
There is nothing to solve here since I used the terminal to update.
I'll search the bug reports more extensively when I have some time later.

Here is my system info:
Operating System: Kubuntu 26.10
KDE Plasma Version: 6.7.5
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
Kernel Version: 7.3.0-10-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700 CPU @ 3.40GHz
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: NVIDIA GeForce GTX 745
Manufacturer: Dell Inc.
Product Name: XPS 8900

Again I updated from the terminal and was able to move forward. I'm searching for the relevant bug report for this.

[SOLVED]WIFI adapter in very old laptop not working It worked in earlyer version of Kubuntu

steve7233 — Wed, 04 Nov 2026 19:56:47 GMT

$ lshw -C network
WARNING: you should run this program as super-us
er.
*-network
description: Network controller
product: BCM4322 802.11a/b/g/n Wireless L
AN Controller
vendor: Broadcom Inc. and subsidiaries
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=b43-pci-bridge late
ncy=0
resources: irq:16 memory:d9500000-d9503ff
f
*-network

Any ideas. Need more information? Tell me what commands to run in the terminal, and I will.

[Software]Birdtray 1.13.0 for Thunderbird — Ubuntu 26.04 Resolute / X11

wonder — Tue, 03 Nov 2026 10:19:33 GMT

Hi everyone,

I’ve published a community edition of Birdtray, based on version 1.11.4, with fixes for the unread-mail counter occasionally stopping its updates.

It retains the familiar features: an unread counter in the system tray, hiding and restoring Thunderbird, folder-specific colors, and other options—all without requiring a Thunderbird extension.

I’ve been using it for several weeks on Kubuntu 26.04 with Plasma 6 and X11, and it has been working well.

The release includes an amd64 .deb package, source code, and documentation in English and Spanish. The original GPLv3 license and author credits are retained.

Project and downloads:
https://github.com/WonderSkydive/birdtray

If you try it, I’d appreciate your feedback and any bug reports.

Thanks!

[Post-Install]Keyboard doesn't work sometimes

vanadiumboy — Sun, 01 Nov 2026 16:31:06 GMT

It seems that the keyboard sometimes doesn't work.

I have Kubuntu 26.04 with Wayland only.

Problem 1:
I copy text in Firefox. I highlight the text. Press Ctrl-C
Press Alt-tab and now I am on LibreOffice Writer

I press Ctrl-V and nothing happens. I can see the copied text in the Clipboard thing.

I do Alt-tab a couple of more times and this fixes the issue. Ctrl-V works again.

Problem 2:
One time, it was in a weird state or some key was considered pressed I think. Firefox was doing some strange things.
I think I pressed a few buttons on the keyboard and I think the "up states" was registered for the keys and it started to work again. I don't know if this was a Alt button problem again.

Problem 3:
One time, it seemed like the Alt button was stuck while I was in LibreOffce Writer. Whatever I pressed on the keyboard, the commands were going to the Writer menu.

======================
I haven't tried another keyboard but I suspect this is a Wayland bug.

[Software]Date issue in kubuntu 26.04

happy winter — Sun, 01 Nov 2026 04:11:07 GMT

Dear All,

I am facing a sudden issue with my laptop's system date and would appreciate some help fixing it. i checked CMOS bios battery it is perfect. in bios it shows correct time and date only in kubuntu it shows different.

My Location/Context:

Location: Chennai, India
Current Actual Date: 1st November 2026
OS/System: Kubuntu 26.04 laptop (Region set to India, date format was correct so many days after installation of kubuntu. suddenly today only i noticed this change. i am not sure from when i am facing this issue).

The Issue:

Whenever I log in and log out, my system date changes unexpectedly. Initially, I noticed that the day was correct, but the month or date kept changing to random numbers. if i move my mouse pointer it shows right time and date. but in display it shows wrong.
To troubleshoot, I restarted my laptop a few times. Now, the system is displaying an entirely incorrect date: 01/14/2026 ( in the date the middle number 14 only keeps on changing. sometimes it even goes 29, 54, 36 etc., see the attached screnshots. i am not sure from where it is pulling the date or month as 29 or 54 , 36 etc.

the system time remains perfectly accurate. I have verified the regional settings; the country is still correctly set to India, and the date/time formats appear configuration-wise correct. if i take the mouse pointer to system tray date time. it highlights the correct date and time. may be the display is wrong.

My Concerns:
Because the system date is wrong, I am worried this will disrupt or corrupt data in my applications (like LibreOffice, thunderbird mail etc) and affect secure web browsing.
Has anyone encountered this sudden date-shifting behavior before? What steps can I take to fix this and stop the date from changing on its own? if i manually change it is correct after i restart the same issue.
Thank you in advance for your support.

below is the screenshot of my laptop settings

cmos bios

system tray clock and calendar (if i take the mouse pointer it shows correct time and date) not in external display

clock settings

regional settings & date and time zones is Inida

please help to fix this issue. if this any settings changed or where and how to change let me know and if other informationed needed please let me know.

thanks & regards,

happy winter

[Software]Elisa player don't load files

trvatrva — Sat, 31 Oct 2026 10:46:20 GMT

Can you explain to me why I can't load music files in Elisa player. I entered Elisa and try to load files but button "+" is not working (it is inactive, see picture down).
My system kubuntu 26.04 LTS.

[RESOLVED]resolution fixed to 1024x768 after update

kubuntutero — Wed, 28 Oct 2026 16:52:55 GMT

After the latest update, my resolution is stuck at 1024x768, and I can't find a way to increase it.

in the "about the system" graphics appears as llvmpipe, i have a 1650 super

edit: the problem fixed itself after a second update

[Software]behavior is not working with usb drives - writing to usb is not accurate, and "early" eject produce hard locked system

suplero — Wed, 28 Oct 2026 03:11:31 GMT

i'm on a test install in 26.04, just upgraded to 26.04.1 and writing a file to a usb drive.

the file is the 4.8gb 26.04.1 iso image.

coming from 24.04, the behavior seemed to be the same broken behavior in 26.04 that 24.04 had - all files sent to the usb "buffer" count as moved files, whether the file write operation on the usb drive is actually finished or not. 26.04 said the 4.8gb iso file "moved" to the usb drive in 20 seconds - which is total lie, but that is the same lie that 24.04 told.

the difference is that in 24.04, when the usb drive is "safely removed", the remove icon spins and spins until the entire file write is complete on the usb drive.

i don't know what happened in 26.04, but after waiting a couple minutes after the pop said "moving finished" (or copy finished, same principle), i clicked to "safely remove" the usb drive.

the entire system locked up. hard lock. almost immediately after clicking safely remove. could this be a hardware issue? maybe, but earlier today in 24.04 the exact same sequence when writing 26.10 to the usb drive worked perfectly.

i didn't think i would ever say this, but i am going to have to start looking for alternate distros now. i've been on kde for over 20 years, and on kubuntu almost since the beginning, with kde 3.
i love the look and feel of kde and have installed on so many machines over the years, work, friends, family, but now the issues are just becoming more than i want to work on.

tips: fix the usb write file bug - in windows the file transfer actually shows write speed and when the write popup disappears, the usb drive can be ejected immediately. this is the expected behavior. why the copy/write popup goes away after mere seconds for huge files is a lie.

no idea why the computer hard locked. i waited 10 minutes to see if the write finished internally on the usb, which might allow 26.04 to unfreeze, but even after 10 minutes it was no go. why should the simple action of clicking to remove the external usb cause a hard lock? definitely not a behavior that i have ever seen in 24.04, and i've done a lot of ejecting after the popup said "finished", but the usb was nowhere near finished writing. same machine. so many files over the last month even.

is there something in 26.04 that would demand more of the hardware?

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.6
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-38-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × 12th Gen Intel® Core™ i5-12400F
Memory: 32 GiB of RAM (31.2 GiB usable)

[Pre-Install]hardware or media issue trying to install 26.10?

suplero — Wed, 28 Oct 2026 01:24:54 GMT

tried installing 26.10 five times today, and every time the installer would start to a full screen (not a fan at all of that full screen installer without any window controls) and it would be black. then after a minute or so, the entire system would do a complete hang, requiring either a power button reset or total power down.

tried with multiple drives, thinking maybe the formatting was an issues, so brand new drive didn't work, ssd didn't work, ssd with windows didn't work. every time the system would hang without error at the full screen black screen.

after 26.10 i tried installing 26.04, and that installer started correctly, but the first install failed, but the second install seemed to finish without issue. the failures don't seem sporadic enough to be a random hardware issue, and 24.04 works on that machine, as does windows.

[Post-Install]multiple encrypted partitions doesn't work after install

suplero — Wed, 28 Oct 2026 01:19:56 GMT

tried installing 26.04 today from an august download - maybe that was the issue, but the install was horrible. the first install was "full install with download updates" and that failed at 87% for some error - i think it was a snap message but i don't remember

then with just "normal install" and no updates it finished

both installs were with 2 encrypted partitions

the reboot after the second install came up where the first partition password worked, but then the second partition password locked up. this is the same symptom as with 24.04, that started last november, but then got fixed at some point around august? the only workaround for the 24.04 bug was to go into a recovery mode boot and that seemed to allow 2 passwords to work.

trying recovery mode in 26.04 locks the system up before the second password prompt even appears. the systemd-rf-kill step. with a regular boot in 26.04, the first password is accepted then the gui locks on the screen to enter the second password, but nothing works once that gui screen appears. the text box doesn't become active.

maybe the 26.04.1 installer is better?

the last update for 24.04 also killed multiple partitions as well, requiring the "recovery mode" option for entering the second password. entering the second password in recovery mode still works on 24.04, but 26.04 hangs before that even in recovery mode.

all these failed updates makes me never want to update once i get a stable login on the system.

[Post-Install]SSH broken .. again

TwoFistedJustice — Tue, 27 Oct 2026 22:15:17 GMT

When I first upgraded to 26.04 my ssh broke. I could no longer push repos to github.

I got the error:

Code:

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

I fixed it by running

Code:

ssh add

And today, out of the blue the problem reoccurs. This time ssh add fails with the error

Code:

ssh: Could not resolve hostname add: Temporary failure in name resolution

DNS seems to be working okay.

Code:

nslookup google.com
Server:        127.0.0.53
Address:    127.0.0.53#53

Non-authoritative answer:
Name:    google.com
Address: 142.251.45.174

Any ideas?

Man I wish I had waited a lot longer to upgrade to 26.04...

[Software]Upgrade to 26.04 from 24.04 caused problems in Dolphin

tudza — Tue, 27 Oct 2026 06:12:02 GMT

I had several folders shared on my Windows 11 machine linked in the Remote section of Dolphin. After the update to t0 26.04 these did not work. It keeps asking for the password and failing to connect.

After trying many things, these mostly work now. However, Dolphin continues to fall back to "can not connect, path does not exist, etc" when I click on one. If I click on one and it doesn't work but another does work, the first one suddenly works again. Then, I click on another, or sometimes the same one, and none of the links to folder on the Windows 11 machine work.

Same behaviour, roughly, with RDP connect to the Windows 11 machine. Sometimes it works and sometimes it refuses to work.

[Pre-Install]Upgrade - no new release found

hallergard — Mon, 26 Oct 2026 09:10:54 GMT

Trying to upgrade from 26.04 LTS to 26.10. Yes, have prompt=normal in update-manager. with do-release-upgrade get:"No new release found" and adding -d get "Could not download the release announcement. Please check your internet connection." My connection works for keeping 26.04 upgraded. What to do?