Comment 19 for bug 1718658

I upgraded from Ubuntu Mate 17.10 to 18.04 after reboot I passed GRUB then I saw logo of Ubuntu Mate and then by screen become black witout anything.
I pressed Ctrl+F1 and swithed to tty1 then logged in and it show me three last errors from dmesg and firts was:
"could not find valid key in user session for sig "
"errorparsing options rc = -2"

So the problem is still present.
Meanwile I checked via mc (midniht commander) and I see that almost all files in my home directory was mounted.
My ~/.ecryptfs/Private.sig file contain two signatures.
I tried a workaround mentioned here: ecryptfs-manager, then press 4 to exit, then run ecrypt-mount-private but this doesn't helped