Logon loop after upgrade

[Grizzlly]

Hi All

My first post here, My last (from working state) upgrade of Unity Noble left me 

in a logon loop, at first I thought my password had been corrupted so I did the 

usual to recover with no change

Then I opened a terminal (Ctrl+Alt+F3) where my password did work, I ran 

apt update --fix-missing
apt -f full-upgrade

but still only get to the loop

any other routes that "may" get me back to a GUI 

Grizz