Hi On a old machine (thinkpad X200s) I installed Ubuntu 16.04 (64bit) as in the machine (Thinkpad X1) I am using for writing this message. While I installed trinity on the X1 via deb http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-sb xenial deps-r14 main-r14 deb-src http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-sb xenial deps-r14 main-r14 For the old X200s machine I chose deb http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x xenial main deb http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x xenial main deb-src http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x xenial main deb-src http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x xenial main Be it as it may, everything was fine on the X200s till I run sudo dpkg-reconfigure tdm-trinity To use tdm-trinity instead of lightdm Now when I try to reboot the machine never shows a login but is in the infinite loop. Any idea what I could do (other than reinstalling the whole beast) thanks