Upgraded from Ubuntu server 16 to 18 and I too am having this issue.
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https://bugs.launchpad.net/bugs/1718658
Title:
ecryptfs-mount-private fails to initialize ecryptfs keys
To manage
Using Linux Mint 17.3. Happened to me when I had half a page of various
formatted text, changed size to 16, then scrolled a little. Whole system
froze up. Alt + F2 did not work. I was using Novuveau 1:1.0.10-1
unbuntu2 drivers. I changed to using Nviedia drivers and the problem
hasn't happened
