After removing canola and disabling extras devel, I also had to apt-get remove python2.5-pyinotify libevas0-engine-software-x11 libevas0-engines-all libevas0-engine-software-generic libevas0-engine-software-x11-16 libevas0-engine-buffer and then run canola clean up, then apt-get install canola2. What a mess!