Am Dienstag 23 Januar 2018 schrieb Uwe Brauer:
> Hi
>
> After I installed successfully trinity on Ubuntu 16.04, I tried to
> shutdown the machine using Control Alt delete: the trinity menus
> pops up, as usual, but then when I chose shutdown, the system only
> logs me out.
>
> Any idea how to solve this?

In kcontrol under system administration (Systemverwaltung) there you can 
configure the login manager. On one of the register cards ("shtudown", I guess) 
you can allow users to shutdown the system. I don't know the default, but you 
can check the option on your system/user account.

Regards,
Stefan