Comment 16 for bug 2024663

Lunar verification

Reproducing the bug. Starting on kinetic with:

ubuntu@k-samba-2024663:~$ apt-cache policy samba-libs
samba-libs:
  Installed: 2:4.16.8+dfsg-0ubuntu1.2
  Candidate: 2:4.16.8+dfsg-0ubuntu1.2
  Version table:
 *** 2:4.16.8+dfsg-0ubuntu1.2 500
        500 http://br.archive.ubuntu.com/ubuntu kinetic-updates/main amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu kinetic-security/main amd64 Packages
        100 /var/lib/dpkg/status

After do-release-upgrade to lunar finishes, we confirm the bug is ther:
$ grep "trying to overwrite" /var/log/dist-upgrade/apt-term.log -B 2
Unpacking winbind (2:4.17.7+dfsg-1ubuntu2) over (2:4.16.8+dfsg-0ubuntu1.2) ...
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: trying to overwrite '/usr/share/man/man8/idmap_rfc2307.8.gz', which is also in package samba-libs:amd64 2:4.16.8+dfsg-0ubuntu1.2
dpkg: warning: overriding problem because --force enabled:
dpkg: warning: trying to overwrite '/usr/share/man/man8/idmap_script.8.gz', which is also in package samba 2:4.16.8+dfsg-0ubuntu1.2

We can also see this used the non-proposed samba packages from lunar: 2:4.17.7+dfsg-1ubuntu2

Repeating the process now, but with proposed enabled:

Confirmed lunar-proposed was used by do-release-upgrade:
Checking for installed snaps

Calculating snap size requirements

Updating repository information
Get:1 http://br.archive.ubuntu.com/ubuntu lunar InRelease [267 kB]
Get:2 http://br.archive.ubuntu.com/ubuntu lunar-proposed InRelease [255 kB]
Get:3 http://br.archive.ubuntu.com/ubuntu lunar-updates InRelease [109 kB]
Get:4 http://br.archive.ubuntu.com/ubuntu lunar-backports InRelease [99.8 kB]
Get:5 http://br.archive.ubuntu.com/ubuntu lunar-security InRelease [109 kB]
(...)

Note this will get not just samba from lunar-proposed, but whatever else is there. It's deemed ok for this SRU verification. A better test would be to enable lunar-proposed and pin only the samba packages.

After do-release-upgrade --allow-third-party is finished, there are messages about "trying to overwrite", like before:

ubuntu@k-samba-2024663:~$ grep "trying to overwrite" /var/log/dist-upgrade/apt-term.log -B 2
ubuntu@k-samba-2024663:~$

And winbind was unpacked just fine:
ubuntu@k-samba-2024663:~$ grep "Unpacking winbind" /var/log/dist-upgrade/apt-term.log -4
Unpacking samba (2:4.17.7+dfsg-1ubuntu2.2) over (2:4.16.8+dfsg-0ubuntu1.2) ...
Preparing to unpack .../18-samba-libs_2%3a4.17.7+dfsg-1ubuntu2.2_amd64.deb ...
Unpacking samba-libs:amd64 (2:4.17.7+dfsg-1ubuntu2.2) over (2:4.16.8+dfsg-0ubuntu1.2) ...
Preparing to unpack .../19-winbind_2%3a4.17.7+dfsg-1ubuntu2.2_amd64.deb ...
Unpacking winbind (2:4.17.7+dfsg-1ubuntu2.2) over (2:4.16.8+dfsg-0ubuntu1.2) ...
Preparing to unpack .../20-samba-common-bin_2%3a4.17.7+dfsg-1ubuntu2.2_amd64.deb ...
Unpacking samba-common-bin (2:4.17.7+dfsg-1ubuntu2.2) over (2:4.16.8+dfsg-0ubuntu1.2) ...
Preparing to unpack .../21-samba-vfs-modules_2%3a4.17.7+dfsg-1ubuntu2.2_amd64.deb ...
Unpacking samba-vfs-modules:amd64 (2:4.17.7+dfsg-1ubuntu2.2) over (2:4.16.8+dfsg-0ubuntu1.2) ...

And finally, we can see that the lunar-proposed version was used: 2:4.17.7+dfsg-1ubuntu2.2

Lunar verification succeeded.