At What Price Backups? (II)

A little update to this post At what price backups? (it's been 7 years man!!!)...
The thing is last week had a similar problem, but the solution posted there didn't help at all...
That means that issuing a:

sudo dmsetup remove udisks-luks-uuid-50508a07-7d38-4be4-975e-ee1d048c1cd6-uid1000

Did nothing at all, refused the umount the encrypted drive.
so What I had to do get rid of the hang volume was:

sudo lsof | grep xxx,x

And then issue a kill:

kill -9 xxx

Without sudo, it was my regular user the one executing what got hung, which incidentally, was the process that generates thumbnails in Thunar.