Some clues here:
https://bugs.edge.launchpad.net/ubuntu/+source/software-center/+bug/652531/comments/4
Looks like ~/.cache/software-center got created as root.root somewhoe.
** Changed in: software-center (Ubuntu)
Importance: Undecided => High
** Changed in: software-center (Ubuntu)
Status: New => Confirmed
** Changed in: software-center (Ubuntu)
Milestone: None => ubuntu-10.10
** Also affects: software-center (Ubuntu Maverick)
Importance: High
Status: Confirmed
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software-center crashed with IOError in _open()
https://bugs.launchpad.net/bugs/652151
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