Bought my father a 64GB Macbook Air as an upgrade to his old Macbook, and thought it was wise to move his ~60GB photo collection (heavens knows why it is so big, bigger than my own collection on Flickr!) to the time capsule.
Didn't realise iPhoto on Mountain Lion would need to upgrade it making it impossible for the old Macbook to access it.
After the long upgrade it seemed to worked. Then all of a sudden the "iPhoto library is locked". The user has write access to the "Data" Volume of the Time Capsule (series 1). There are many suggestions to run iPhoto holding down option+cmd to repair, but it doesn't work. It just goes to the "Caution" dialog and quits.
I am a Archlinux user, so I'm very comfortable on the command line.