After I installed Banshee, apt-get is stuck (neither installed, or uninstalled) on the libubuntuone1.0-cil package:
Setting up libubuntuone1.0-cil (0.3.8-0ubuntu5) ...
* Installing 1 assembly from libubuntuone1.0-cil into Mono
E: installing Assembly /usr/lib/cli/ubuntuone-sharp-1.0/ubuntuone-sharp.dll failed
E: Installation of libubuntuone1.0-cil with /usr/share/cli-common/runtimes.d/mono failed
dpkg: error processing libubuntuone1.0-cil (--configure):
subprocess installed post-installation script returned error exit status 9
Errors were encountered while processing:
libubuntuone1.0-cil