sudo apt-get upgrade fails with this error:
Removing lxdm (0.5.3-1) ...
update-rc.d: error: no runlevel symlinks to modify, aborting!
dpkg: error processing package lxdm (--remove):
subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
lxdm
E: Sub-process /usr/bin/dpkg returned an error code (1)