Comment # 8 on bug 1132462 from Pi Ny

(In reply to Franck Bui from comment #7)
> (In reply to Pi Ny from comment #6)
> > peter@nue-p1:~> sudo ps -u charly
> > [sudo] password for root: 
> >   PID TTY          TIME CMD
> >  3927 ?        00:00:00 screen
> >  3928 pts/3    00:00:00 bash
> > 
> > (-> session survived logout!)
> 
> It works as expected here, the session is cleared after following your test
> case.
> 
> Are you sure you set KillUserProcesses=yes for "nue-p1" ?

just to be sure:

nue-p1:~ # grep -v "^#" /etc/systemd/logind.conf 

[Login]
KillUserProcesses=yes
KillExcludeUsers=root