Slávek Banko composed on 2020-01-01 02:49 (UTC+0100):
now I realized one potential problem when updating from a previous version: During the tdm-trinity upgrade, the previous version of the package performs an unwanted removal of the init script /etc/init.d/tdm. If your system uses init scripts, this can be a critical issue. The best way to get the init script back is:
apt-get purge tdm-trinity && apt-get install tdm-trinity
Didn't work for me with Upstart 16.04 -> 18.04. /etc/init.d/tdm-trinity is symlinked to a non-existent /lib/init/upstart-job, duly noted in the journal without saying anything helpful. There is a backtrace in Xorg, but I can't ID the cause: http://fm.no-ip.com/Tmp/Linux/TDE/xorg0log-p5bse-u1804.txt