Hi,
Same problem here.
12.04 64bits
tpu://Canon/MP540_series/SN=1153C9The printing seem to work, there is a warning about the connection to the tpintdeamon.
Here is the apport.log:
juan@familynux:~$ cat /var/log/apport.log
ERROR: apport (pid 3853) Wed May 30 09:19:38 2012: called for pid 1228, signal 11
ERROR: apport (pid 3853) Wed May 30 09:19:38 2012: executable: /usr/bin/tprintdaemon (command line "/usr/bin/tprintdaemon 0")
ERROR: apport (pid 3853) Wed May 30 09:19:38 2012: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 3853) Wed May 30 09:19:38 2012: this executable already crashed 2 times, ignoring
hope this will help.