[snap] fail to launch after logging in to a wayland session then back into an X11 session

[Olivier Tilloy]

My default session is "Ubuntu" (/usr/share/xsessions/ubuntu.desktop). If I log out, then log in to "Ubuntu on Wayland", then out again and in to "Ubuntu" again (so I'm back to my initial session), the libreoffice snap fails to start:

osomon@bribon:~$ /snap/bin/libreoffice
/snap/libreoffice/49/lib/libreoffice/program/soffice.bin X11 error: Can't open display:
   Set DISPLAY environment variable, use -display option
   or check permissions of your X-Server
   (See "man X" resp. "man xhost" for details)

osomon@bribon:~$ env | grep DISPLAY
DISPLAY=:0

Rebooting my machine "fixes" the issue.

[Olivier Tilloy (osomon)]

This is not specific to libreoffice. The gnome-calculator snap exhibits the same issue:

(gnome-calculator:7802): Gtk-WARNING **: cannot open display: :0

[Olivier Tilloy (osomon)]

After logging into to wayland and then back into X11, a wayland socket is lingering:

$ ls -l /run/user/`id -u`/wayland*
srwxrwxr-x 1 osomon osomon 0 févr. 14 16:54 /run/user/1000/wayland-0
-rw-rw---- 1 osomon osomon 0 févr. 14 16:54 /run/user/1000/wayland-0.lock

Removing those two files "fixes" the issue.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ken VanDine (ken-vandine)]

I have reproduced this issue on 17.10. After logging out of a wayland session, the socket is left behind.

[Vadym K (hmvs)]

Same for 18.04