Just to add some further information: I have found that if I install without ticking the "Encrypt Home Folder" checkbox, and I then encrypt the home folder post installation (using sudo ecryptfs-migrate-home -u user), then start-up and shutdown operations are normal (quite fast).
Just to add some further information: I have found that if I install without ticking the "Encrypt Home Folder" checkbox, and I then encrypt the home folder post installation (using sudo ecryptfs- migrate- home -u user), then start-up and shutdown operations are normal (quite fast).