I've been getting this since I upgraded to 16.10
It shows in the lightdm log, so maybe a problem with lightdm
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https://bugs.launchpad.net/bugs/1538647
Title:
Seat seat0: Plymouth is
[Expired for plymouth (Ubuntu) because there has been no activity for 60
days.]
** Changed in: plymouth (Ubuntu)
Status: Incomplete => Expired
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Does not know if its expected or not in fact
** Changed in: plymouth (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1538647
Title:
Seat seat0: Plymouth is