Ah, thanks for that additional information! I was able to recreate this
issue by upgrading from bionic to focal and then running 'sudo ./focal
--frontend DistUpgradeViewText' in the folder in which the release
upgrader was extracted e.g. '/tmp/ubuntu-release-upgrader-nbgn2n5o'.
Perhaps the distribution upgrade process should remove the
sources.list.distUpgrade file after the release upgrade successfully
completes.
bdmurray@clean-bionic-amd64:/tmp/ubuntu-release-upgrader-nbgn2n5o$ ls -lh
/etc/apt/
total 36K
drwxr-xr-x 2 root root 4.0K Aug 22 09:47 apt.conf.d
drwxr-xr-x 2 root root 4.0K Mar 11 2019 auth.conf.d
drwxr-xr-x 2 root root 4.0K Apr 20 2018 preferences.d
-rw-rw-r-- 1 root root 676 Aug 24 10:42 sources.list
drwxr-xr-x 2 root root 4.0K Aug 22 07:28 sources.list.d
-rw-rw-r-- 1 root root 676 Aug 22 07:28 sources.list.distUpgrade
-rw-rw-r-- 1 root root 2.9K Aug 13 2018 sources.list.ori
-rw-rw-r-- 1 root root 674 Aug 22 07:24 sources.list.save
drwxr-xr-x 2 root root 4.0K Aug 22 07:37 trusted.gpg.d
bdmurray@clean-bionic-amd64:/tmp/ubuntu-release-upgrader-nbgn2n5o$ md5sum
/etc/apt/sources.list /etc/apt/sources.list.distUpgrade
1d22517b154947f8a818e36f6edf7c62 /etc/apt/sources.list
1d22517b154947f8a818e36f6edf7c62 /etc/apt/sources.list.distUpgrade
** Changed in: ubuntu-release-upgrader (Ubuntu Groovy)
Status: Incomplete => Confirmed
** Summary changed:
- upgrade from bionic to focal a server with molly-guard moves back
sources.list to bionic entries
+ after upgrading running the upgrader again can restore your sources.list file
to the previous release
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https://bugs.launchpad.net/bugs/1888916
Title:
after upgrading running the upgrader again can restore your
sources.list file to the previous release
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