How to make gdm not take out brains?

Question

linux

Ubuntu 18.10

The problem happens sometimes when manipulating monitors. And almost always when changing the shell, I have a gnome and i3vm. When a problem happens, I either see a black screen, or I am thrown in circles on the password entry form. Restart gdma does not help, reboot too. Control + alt + fN also defies any logic, the gnome can be on any number, on the rest of the console, and they also wander between numbers. Who faced, tell me where you can see or somehow zadebazhit what is happening. This is completely unintuitive, I sit for half an hour, rebooting everything, climbing on the consoles with these, re-login 20 times, and then bam and on some random f-button the gnome rises. I feel a lack of some knowledge of the internal structure of this dwarf. It is beautiful, but this problem kills simply, especially with its suddenness. And the complete lack of visible logic

Answer 1

Check from the console ( df -h) whether there is enough space in the home directory and in general on the PC. Sometimes there is a cyclic login because of this.

Answer 2

there are at least a few options.

1. try i3wm + GNOME
   did not try it myself, but as an option
   

   GDM (optional, but useful)

   
   perhaps there is additional integration with gdm, xs
   
2. uninstall GDM and try another DM(Display manager)
   
3. if password protection is unnecessary, then you can generally refuse DM and set up auto-login for shells when switching to the desired one using Ctrl + Alt + [number]
   
4. if password protection is needed, then why is the console bad? boot into the desired tty and drive in the username and password and that's it. When I used several environments, I simply
   added code to .bash_profile or .zprofile depending on the shell used (bash or zsh)
   
   spoiler

   if ; then
     case "$(tty)" in
       "/dev/tty1" )   # Sway wayland
               QT_QPA_PLATFORM=wayland \
               CLUTTER_BACKEND=wayland \
               MOZ_ENABLE_WAYLAND=1 \
               SDL_VIDEODRIVER=wayland \
               XDG_SESSION_TYPE=wayland \
               BEMENU_BACKEND=wayland \
               XKB_DEFAULT_LAYOUT=us \
               exec sway
               ;;
       "/dev/tty2" )   # i3 X
               startx /usr/bin/i3
               ;;
       "/dev/tty3" )   # Gnome wayland
               QT_QPA_PLATFORM=wayland \
               CLUTTER_BACKEND=wayland \
               MOZ_ENABLE_WAYLAND=1 \
               SDL_VIDEODRIVER=wayland \
               XDG_SESSION_TYPE=wayland \
               exec dbus-run-session gnome-session
               ;;
     esac
   fi

   
   where on different tty after switching and entering the login / password, the corresponding shell is entered Ctrl
   +Alt+1 (tty1) - sway
   Ctrl+Alt+2 (tty2) - i3
   Ctrl+Alt+3 (tty3) - gnome
   everything works fine under Arch-em, under Ubuntu, most likely, too, although their own nuances are possible
   

Answer 3

try lightdm, or kdm.
but kdm had its troubles.