I tested a release upgrade from Bionic to Focal and confirm that my sources.list file was not reverted back to Artful.
bdmurray@clean-bionic-amd64:/tmp/20.04$ head /var/log/dist-upgrade/main.log 2020-08-31 08:01:42,527 INFO Using config files '['./DistUpgrade.cfg.bionic']' 2020-08-31 08:01:42,527 INFO uname information: 'Linux clean-bionic-amd64 5.4.0-42-generic #46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64' 2020-08-31 08:01:42,819 INFO apt version: '1.6.12ubuntu0.1' 2020-08-31 08:01:42,820 INFO python version: '3.6.9 (default, Jul 17 2020, 12:50:27) [GCC 8.4.0]' 2020-08-31 08:01:42,822 INFO release-upgrader version '20.04.25' started bdmurray@clean-bionic-amd64:/tmp/20.04$ grep -A12 "no entry" /var/log/dist-upgrade/screenlog.0 While scanning your repository information no entry about bionic could be found. An upgrade might not succeed. Do you want to continue anyway? Continue [yN] n Restoring original system state Aborting Reading package lists... Done bdmurray@clean-bionic-amd64:/tmp/20.04$ cat /etc/apt/sources.list deb http://192.168.10.7/ubuntu focal main restricted universe multiverse deb http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse #deb http://192.168.10.7/ubuntu focal-proposed main restricted universe multiverse deb http://192.168.10.7/ubuntu focal-security main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse #deb-src http://192.168.10.7/ubuntu focal-proposed main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal-security main restricted universe multiverse Keep in mind the sources.list file is correct as the test case had you modify it to the release which you are upgrading. bdmurray@clean-bionic-amd64:/tmp/20.04$ md5sum /etc/apt/sources.list 6d4439d7fd3f142f81b70e00abd7b95a /etc/apt/sources.list bdmurray@clean-bionic-amd64:/tmp/20.04$ md5sum /etc/apt/sources.list.distUpgrade 6d4439d7fd3f142f81b70e00abd7b95a /etc/apt/sources.list.distUpgrade -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1888916 Title: release upgrader can restore sources.list file from a previous release upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1888916/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
