Update keeps failing

[MichaelEber]

My wife's computer is out of date. I am offered to update to Kubuntu 26.4 which I want to do. But when I click on the box telling it to install the update I get a window that says the install failed. The failure text is blank. What the heck

Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-41-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i3-N305
Memory: 8 GiB of RAM (7,5 GiB usable)
Graphics Processor: Intel® Graphics
Manufacturer: LENOVO
Product Name: 82XB
System Version: IdeaPad Slim 3 15IAN8

This is installed loclly on my wife's computer.

[kc1di]

update don't always work and I recommend doing a fresh install after backing up important data.
you may want to try using the terminal and do the upgrade. if that does not work you'll need to do the fresh full install from live usb.
https://www.ubuntufree.com/upgrade-t...rminal-upgrade
That was writtern for 24.04 to 26.04 but should work for 25.10 also. Good luck .
Important though do a back up first!

[skyfishgoo]

there was a major outage yesterday, try it gain today

[Snowhog]

Ignore this post.

Another issue is that the OPs wife's PC is running 25.10, which reached EOL on July 9, 2026. Now that isn't that long ago, but it is still probable that the 25.10 repositories are no longer available. Therefore, in order to upgrade to 26.04:

To upgrade Kubuntu 25.10 ("Questing Quokka"), which reached its End-of-Life (EOL) in July 2026, you must upgrade directly to the active Kubuntu 26.04 LTS ("Resolute Raccoon").
Because Kubuntu 25.10 is a non-LTS interim release, its upgrade path leads straight to the next consecutive release (26.04 LTS). Follow these command-line instructions to complete the process.

1. Update Repository Sources
Since 25.10 is recently retired, its packages are being moved to the old-releases servers. Update your package manager to point to the correct archive:

• Open your terminal (Konsole).
• Run this command to automatically change the mirrors in your source list to the old-releases server:
  
  sudo sed -i -e 's/://ubuntu.com' -e 's/://ubuntu.com' /etc/apt/sources.list
  
  Use code with caution.
• Update your package lists and install any final remaining 25.10 packages:
  
  sudo apt update && sudo apt full-upgrade -y
  
  Use code with caution.
• Restart your system to ensure everything is running clean before the version jump:
  
  sudo reboot
  
  Use code with caution.

2. Configure the Release Upgrader
You need to make sure the core upgrade tools are present and configured to see the next distribution release.

• Install the essential release management software: bash
  
  sudo apt install update-manager-core ubuntu-release-upgrader-qt -y
  
  Use code with caution.
• Open the release upgrades configuration file:
  
  sudo nano /etc/update-manager/release-upgrades
  
  Use code with caution.
• Look for the Prompt= line. Ensure it is set to Prompt=normal. (This configuration allows interim releases like 25.10 to look for the next upgrade).
• Press Ctrl + O and then Enter to save, followed by Ctrl + X to exit the nano editor.

3. Run the Upgrade Command
Start the upgrade process directly inside the terminal.

• Execute the release upgrade tool:
  
  sudo do-release-upgrade
  
  Use code with caution.
• If the upgrader claims no release is found: Force it to seek the latest release path via the development/distribution channel by appending the -d flag:
  
  
  sudo do-release-upgrade -d
  
  Use code with caution.
• Follow the on-screen terminal prompts. Type y when asked to confirm downloading and installing the new package sets.
• Once completed, the terminal will prompt you to restart. Reboot your computer to finish initializing Kubuntu 26.04 LTS.

[claydoh]

1. Update Repository Sources

No, don't do this!

25.10 has not had is repos moved to old-releases yet. Neither has 25.04, either for that matter.

https://old-releases.ubuntu.com/ubuntu/dists/

https://help.ubuntu.com/community/EOLUpgrades should still be valid, even if some references and examples are old.