Comment 52 for bug 1718658

I am getting exactly the same issue here after upgrading from 18.04 to 20.04. I use a custom folder and have some shell utilities to run the mount command with the right paramaters. Below SIG and FNEK_SIG continue to match what `ecryptfs-add-passphrase --fnek` reports (and the same as before the update). I am seeing the same in kernel logs via `dmesg` as OP reported.

mount -t ecryptfs /home/marius/Dropbox/private /home/marius/private -o ecryptfs_sig=<SIG>,ecryptfs_fnek_sig=<FNEK_SIG>,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_passthrough=n

$ uname -mrs Linux 5.4.0-37-generic x86_64

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal