Sounds like an AppArmor profile issue. Can you please do "dmesg >
/tmp/dmesg.txt" right after this happens (switch back to your normal
session before) and attach /tmp/dmesg.txt here?
** Changed in: gdm-guest-session (Ubuntu)
Status: New => Incomplete
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no flash in guest session
https://bugs.launchpad.net/bugs/282132
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