On Linux Mint Serena 18.1 (based on Xenial 16.04.1)
When the unmount does not happen, I can see this kind of lines in my syslog:
(...) umount.ecryptfs: Failed to find key with sig [deadbeefdeadbeef]:
Required key not available
** Also affects: ecryptfs
Importance: Undecided
Status: New
Sorry, the info was already provided by OP. For some reason I failed to
read that lines :-(
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https://bugs.launchpad.net/bugs/1595469
Title:
Logout umounts encrypted home only every seco
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ecryptfs-utils (Ubuntu)
Status: New => Confirmed
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Titl