Comment 1 for bug 948719

Confirmed:

The following packages will be REMOVED:
  keystone
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 106 kB disk space will be freed.
Do you want to continue [Y/n]?
(Reading database ... 19524 files and directories currently installed.)
Removing keystone ...
dpkg: error processing keystone (--remove):
 subprocess installed pre-removal script returned error exit status 10
postinst called with unknown argument `abort-remove'
Errors were encountered while processing:
 keystone
E: Sub-process /usr/bin/dpkg returned an error code (1)