I run the updater this morning and after logging in I was asked to record my encryption passphrase (which I had done when I first installed).
Picture explains what happened.
I can still get to my files/email okay, but thought it best to say something happened, and should I report as BUG?
The computer this happened on as an old Toshiba NB100 that origanlly came with Ubuntu 10.10.
Well, this won’t have been as a result of MATE packages so see if ecryptfs-utils were updated (or related packages) and file a bug there 
At the same day , after a fresh install of 15.04 , I could not update the system with app , only at the terminal .A message says that update would remove some essencial to the system ; I tried with software-center and it freeze . So I update and upgrade at terminal , then I used the app .
Thank you, will do that.
