Comment 3 for bug 970627

FWIW, deleting a file related to the software center seemed to resolve the problem:

Dmesg output:
[36001.147151] Valid eCryptfs headers not found in file header region or xattr region, inode 26480627
[36001.147155] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO

nickfarr@Edwards:~$ find -inum 26480627
./.cache/software-center/rnrclient/reviews.ubuntu.com,reviews,api,1.0,reviews,filter,en,any,any,any,skype,page,3,helpful,,abad90c03c6324790656169a4909c053

Removing the file fixed the problem...