For a year now I have used Debian with LXDE and autologin without any problem. But after adding automount.units to systemd I did not get a GUI on boot. In single user (recovery) mode I ran journalctl -xb.
At the end the journal said that the spawned proces at /bin/plymouth could not be executed; the service failed. There is no /bin/plymouth on my system. I googled and read that a common cause of this error is fstab. I checked and excluded fstab as a cause. I started X as root and got a pretty bare GUI (as to be expected). I did “xhost +” and changed to user. Then I had access to most programs, but not the LXDE environment. I decided to reinstall lightdm (which overwrote autologin). I booted again and got the login screen of lightdm. I logged in with my user account, but no LXDE at all, only the Debian background.
My conclusion is that lightdm and X do start, but for some reason no connection is made to the configuration of my user account. What could possibly be the cause of this?
Any help will be very much appreciated.