do-release-upgrade hangs at The user 'syslog' is already a member of 'adm' every single time

[amar]

Uuntu 15.10

> $ sudo apt-cache policy rsyslog

> rsyslog:
> Installed: 8.12.0-1ubuntu2
> Candidate: 8.12.0-1ubuntu2
> Version table:
> *** 8.12.0-1ubuntu2 0
> 500 http://ubuntu-archive.mirror.serveriai.lt/ubuntu/ wily/main amd64 Packages
> 100 /var/lib/dpkg/status

Whenever I try to run any command that is to reinstall/fix rsylog or try to upgrade my Ubuntu server (by running `do-release-upgrade`) it ends in:

> Reading cache
>
> Checking package manager
>
> Setting up rsyslog (8.12.0-1ubuntu2) ...

> The user 'syslog' is already a member of 'adm'.

Because of this I am locked on **Ubuntu 15.10**.

**Note**: I started getting this error after I upgraded from `15.04` when system was setting up after upgrade to `15.10`. I was asked to choose version and it said `N` for default or existing version and I went for it.

What I expect: To peacefully upgrade my VPS Ubuntu version to 16.04.

[Benedikt Tröster (b-troester)]

I have the same issue, but instead of "N" I chose "Y" (to replace rsyslog), which failed as well

[Benedikt Tröster (b-troester)]

Ok, I got it:
1. purge rsyslog with: "sudo apt purge rsyslog"
2. Install the new distro with either "sudo apt dist-upgrade" or "do-release-upgrade"
3. I had one error in the first run of do-release-upgrade, I just re-ran it and now it went through and I'm on 17.04...profit?