I have reproduced this issue on 17.10. After logging out of a wayland
session, the socket is left behind.
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[snap] fail to launch after logging in to a wayland session then back
into an X11 session
Status in libreoffice package in Ubuntu:
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:
/snap/libreoffice/49/lib/libreoffice/program/soffice.bin X11 error: Can't
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
Rebooting my machine "fixes" the issue.
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