This bug was fixed in the package ubuntu-release-upgrader - 1:20.04.25
---------------
ubuntu-release-upgrader (1:20.04.25) focal; urgency=medium
* DistUpgrade/DistUpgradeQuirks.py: Add a check for ROS packages being
installed and warn that upgrades with them installed are not likely to
work. Thanks to Kyle Fazzari for the patch. (LP: #1611737)
* DistUpgrade/DistUpgradeController.py: do what the comment says and really
back up /etc/apt/sources.list first. (LP: #1888916)
-- Brian Murray <[email protected]> Wed, 26 Aug 2020 08:36:39 -0700
** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1888916
Title:
release upgrader can restore sources.list file from a previous release
upgrade
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