Looking through the logs it appears to be caused by my selection of
'Require password to login and decrypt home partition'
UbiquitySyslog:850ish:
Jan 22 16:18:27 ubuntu user-setup: ecryptfs-add-passphrase: error while loading
shared libraries: libecryptfs.so.0: cannot open shared object file: No
*** This bug is a duplicate of bug 258603 ***
https://bugs.launchpad.net/bugs/258603
** Tags removed: need-duplicate-check
** Attachment removed: "Dependencies.txt"
http://launchpadlibrarian.net/21539679/Dependencies.txt
** Attachment removed: "ProcMaps.txt"
http://launchpadlibrarian