I've setup latest Ubuntu 22.04 (jammy) to use lightdm, and enabled the guest account via a lightdm config.
This seems to work fine, and can login with an ephemeral guest account that gets removed on logout.
However, it appears that Firefox can't start, due to being unable to create temp files (/tmp/guest-dheud/snap/firefox/1443). It's strange to me that any user couldnt write to /tmp, what could fix this? Gonna hash more out and see what can be done but didn't know if anyone could give a nudge
Specific error message:
cannot create user data directory: /tmp/guest-hfuebh/snap/firefox/1443: Permission denied
The interesting part here is the directory seems to exist, and writable by the guest user.. unsure why it says permission denied. Does Firefox run as a snap as default?
Looking into it, I found that the guest user's home directory actually is /tmp/guest-fsdfdew/, which is probably the source of my woes... This isn't a problem when the user's home is in /home, but an issue when it exists in /tmp... is is possible to set lightdm to create the home dir in /home instead?
Update:
Looks like changing the guest's home dir to /home is harder than thought. I have tweaked the /usr/bin/guest-account script to make the dir in the desired place, but something is killing the session when the session starts (nothing helpful in lightdm.log, just says Session exited with return value 1), and can't find any .xsession-errors.
