I tried to reproduce this. Step 1: Add the repository via following https://support.mozilla.org/en- US/kb/install-firefox-linux "For Debian Bookworm or older" instructions.
$ ls /etc/apt/sources.list.d/elastic-8.x.list extrepo_librewolf.sources.save tailscale.list ubuntu.sources.save extrepo_librewolf.sources mozilla.list ubuntu.sources xtradeb-ubuntu-apps-plucky.sources Step 2: Start upgrade process to 25.10 via do-release-upgrade. [NOT THE GUI] [... will edit this comment with the results of the upgrade -- since the browser may need to close during the upgrade process...] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2130273 Title: do-release-upgrade deletes sources.list format entries during update to 25.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2130273/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
