(This is similar to the closed topic: Software updater - failed to download repository information. I hope it’s okay I’m made a new one as I’m running a much newer version and have different outputs. I’ll respond to the replies received in the original topic.)
I’ll also mention that I’m having issues with Firmware Updater and I had a rocky installation process due to what seems to be an ongoing bootloader issue. Someone suggested I should disable fastboot, delete everything on my drive, and re-install Ubuntu once more. I’m not sure if that’d complicate solving this issue so I’ll wait to see what others have to say.
I’m running Ubuntu Desktop 25.10 (GNOME) and when running Software Updater I receive the following error:
Failed to download repository information
Check your internet connection.
I ran sudo apt update and received an error and some notices. I lost the copy of the original output but the first notice I addressed was:
Some sources can be modernized. Run ‘apt modernize-sources’ to do so
I then ran the modernization command following these steps which included creating a backup thinking that’d solve the problem.
Now when I run sudo apt update I get the following output (I believe it’s the same as before but without the modernization notice):
Ign:1 file:/cdrom questing InRelease
Err:2 file:/cdrom questing Release
File not found - /cdrom/dists/questing/Release (2: No such file or directory)
Hit:3 Index of /ubuntu questing-security InRelease
Hit:4 Index of /ubuntu questing InRelease
Hit:5 Index of /ubuntu questing-updates InRelease
Hit:6 Index of /ubuntu questing-backports InRelease
Error: The repository ‘file:/cdrom questing Release’ no longer has a Release file.
Notice: Updating from such a repository can’t be done securely, and is therefore disabled by default.
Notice: See apt-secure(8) manpage for repository creation and user configuration details.
(The following are outputs I’m getting after modernization.)
sudo apt-dist-upgrade output:
sudo-rs: ‘apt-dist-upgrade’: command not found
Repos:
Active apt repos in: /etc/apt/sources.list.d/ubuntu.sources
1: deb Index of /ubuntu questing questing-updates questing-backports main restricted universe multiverse
2: deb Index of /ubuntu questing-security main restricted universe multiverse
3: deb file:/cdrom/ questing main restricted
I shared the sudo apt update output at the beginning. First output for sudo apt full-upgrade was:
The following package was automatically installed and is no longer required: grub-pc-bin Use 'sudo apt autoremove' to remove it. Upgrading: distro-info-data Summary: Upgrading: 1, Installing: 0, Removing: 0, Not Upgrading: 0 Download size: 6962 B Space needed: 0 B / 940 GB available Continue? [Y/n] y Get:1 http://ca.archive.ubuntu.com/ubuntu questing-updates/main amd64 distro-info-data all 0.66ubuntu0.1 [6962 B] Fetched 6962 B in 0s (16.5 kB/s) (Reading database ... 164381 files and directories currently installed.) Preparing to unpack .../distro-info-data_0.66ubuntu0.1_all.deb ... Unpacking distro-info-data (0.66ubuntu0.1) over (0.66) ... Setting up distro-info-data (0.66ubuntu0.1) ...
Running sudo apt full-upgrade a second time:
The following package was automatically installed and is no longer required:
grub-pc-bin
Use ‘sudo apt autoremove’ to remove it.Summary:
Upgrading: 0, Installing: 0, Removing: 0, Not Upgrading: 0
Output for sudo apt dist-upgrade is identical:
The following package was automatically installed and is no longer required:
grub-pc-bin
Use ‘sudo apt autoremove’ to remove it.Summary:
Upgrading: 0, Installing: 0, Removing: 0, Not Upgrading: 0