This is basically a duplicate of bug 2110032 and bug 2086506.
The python-apt package cannot handle the [signed-by=] specifier in the
mozilla.list sources line. It considers this an "invalid" source, and
when ubuntu-release-upgrader is iterating over the configured sources,
it skips invalid ones. So, that's one problem.
The other problem is that despite not being able to migrate the file,
ubuntu-release-upgrader does not restore the original. That's a second
problem, and needs to be fixed in ubuntu-release-upgrader.
** Also affects: python-apt (Ubuntu)
Importance: Undecided
Status: New
** Changed in: python-apt (Ubuntu)
Status: New => Confirmed
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Triaged
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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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