[Bug 1888916] Re: upgrade from bionic to focal a server with molly-guard moves back sources.list to bionic entries

[Brian Murray]

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 at 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 at 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

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader source package in Groovy:
  Confirmed

Bug description:
  I've upgraded a server via `do-release-upgrade` from Ubuntu Bionic to
  Focal, with molly-guard installed on it - molly-guard configured to
  always ask for the hostname.

  After it has finished:

  ```
  System upgrade is complete.

  Restart required

  To finish the upgrade, a restart is required. 
  If you select 'y' the system will be restarted. 

  Continue [yN] y
  I: molly-guard: reboot is always molly-guarded on this system.
  Please type in hostname of the machine to reboot: 
  Good thing I asked; I won't reboot bates ...

  
  === Command detached from window (Tue Jul 21 15:23:36 2020) ===

  === Command terminated normally (Tue Jul 21 15:23:46 2020) ===
  ```

  It doesn't alert you it was restoring original state of sources.list. 
  After rebooting the system and it came back up showing `Welcome to Ubuntu 20.04 LTS`, I've just noticed it was pointing out to bionic instead of focal installing a package.

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