Public bug reported:
To reproduce:
1. On Ubuntu 25.04, add a repository in the old sources.list format
(https://wiki.debian.org/SourcesList#sources.list_format). For example, I've
added the Mozilla Firefox repo via following
https://support.mozilla.org/en-US/kb/install-firefox-linux "For Debian Bookworm
or older" instructions.
2. Start upgrade process to 25.10 via do-release-upgrade. In the beginning of
the process, the sources.list format repos will be moved into e.g.
"mozilla.list.migrate", while the deb822 repos will be copied into e.g.
"ubuntu.sources.distUpgrade"
3. Finish upgrade. All files with deb822 format will still be there, but
mozilla.list will be gone entirely.
** Affects: plasma-distro-release-notifier (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "ubuntu-bug output"
https://bugs.launchpad.net/bugs/2130273/+attachment/5922167/+files/apport.ubuntu-release-upgrader-core._4pn5nx1.apport
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https://bugs.launchpad.net/bugs/2130273
Title:
do-release-upgrade deletes sources.list format entries during update
to 25.10
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