Suddenly Bitcoin Installation Not Detected

[xcsler]

Lat night, after running smoothly for about 7 months I got the message that Armory can't find my Bitcon installation.
I'm running Linux Mint and a slightly older version of Armory (I think 0.91 but not in front of my computer right now).
I'm not 100% sure but last night I think I also got a notification in my Mint OS about disk space in my home folder being low but when I checked it looked like I had plenty of free space (>500 GB). I think that's what the notification was but again not certain.

Has anyone else had this happen and have a solution? What could have caused this?

Help appreciated.