Jammy verification

a) Specific test for this bug

Reproducing the bug with jammy packages, and no syslog user

ubuntu@j-frr-packaging-regression:~$ id syslog
id: ‘syslog’: no such user

ubuntu@j-frr-packaging-regression:~$ sudo apt install frr -y
(...)
Setting up frr (8.1-1ubuntu1.2) ...
Adding group `frrvty' (GID 111) ...
Done.
Adding group `frr' (GID 116) ...
Done.
Warning: The home dir /nonexistent you specified can't be accessed: No such file or directory
Adding system user `frr' (UID 104) ...
Adding new user `frr' (UID 104) with group `frr' ...
Not creating home directory `/nonexistent'.
chown: invalid user: ‘syslog:adm’
dpkg: error processing package frr (--configure):
 installed frr package post-installation script subprocess returned error exit status 1


ubuntu@j-frr-packaging-regression:~$ apt-cache policy frr
frr:
  Installed: 8.1-1ubuntu1.2
  Candidate: 8.1-1ubuntu1.2
  Version table:
 *** 8.1-1ubuntu1.2 500
        500 http://br.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu jammy-security/main amd64 Packages
        100 /var/lib/dpkg/status
     8.1-1ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

Updating to the proposed package fixes the installation:
(...)
Preparing to unpack .../frr_8.1-1ubuntu1.3_amd64.deb ...
Unpacking frr (8.1-1ubuntu1.3) over (8.1-1ubuntu1.2) ...
Setting up frr (8.1-1ubuntu1.3) ...
addgroup: The group `frrvty' already exists as a system group. Exiting.
addgroup: The group `frr' already exists as a system group. Exiting.
Warning: The home dir /nonexistent you specified can't be accessed: No such file or directory
The system user `frr' already exists. Exiting.
Created symlink /etc/systemd/system/multi-user.target.wants/frr.service → /lib/systemd/system/frr.service.
Setting up frr-pythontools (8.1-1ubuntu1.2) ...
Processing triggers for man-db (2.10.2-1) ...

ubuntu@j-frr-packaging-regression:~$ apt-cache policy frr
frr:
  Installed: 8.1-1ubuntu1.3
  Candidate: 8.1-1ubuntu1.3
  Version table:
 *** 8.1-1ubuntu1.3 500
        500 http://br.archive.ubuntu.com/ubuntu jammy-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     8.1-1ubuntu1.2 500
        500 http://br.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu jammy-security/main amd64 Packages
     8.1-1ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu jammy/main amd64 Packages


Fresh install of the proposed package on a system without the syslog user also works:
ubuntu@j-frr-packaging-regression:~$ id syslog
id: ‘syslog’: no such user
ubuntu@j-frr-packaging-regression:~$ sudo apt install frr -y
(...)
Setting up frr (8.1-1ubuntu1.3) ...
Adding group `frrvty' (GID 111) ...
Done.
Adding group `frr' (GID 116) ...
Done.
Warning: The home dir /nonexistent you specified can't be accessed: No such file or directory
Adding system user `frr' (UID 104) ...
Adding new user `frr' (UID 104) with group `frr' ...
Not creating home directory `/nonexistent'.
Created symlink /etc/systemd/system/multi-user.target.wants/frr.service → /lib/systemd/system/frr.service.
Setting up frr-pythontools (8.1-1ubuntu1.3) ...
Processing triggers for man-db (2.10.2-1) ...
Processing triggers for libc-bin (2.35-0ubuntu3.1) ...

ubuntu@j-frr-packaging-regression:~$ apt-cache policy frr
frr:
  Installed: 8.1-1ubuntu1.3
  Candidate: 8.1-1ubuntu1.3
  Version table:
 *** 8.1-1ubuntu1.3 500
        500 http://br.archive.ubuntu.com/ubuntu jammy-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     8.1-1ubuntu1.2 500
        500 http://br.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu jammy-security/main amd64 Packages
     8.1-1ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu jammy/main amd64 Packages