Removing xul-ext-webaccounts (0.5-0ubuntu2) ...
Removing webaccounts-extension-common (0.5-0ubuntu2) ...
Purging configuration files for webaccounts-extension-common (0.5-0ubuntu2) ...
Removing unity-control-center-signon (0.1.7~+14.04.20140211.2-0ubuntu4) ...
Removing ubuntu-desktop (1.325) ...
Removing unity-control-center (14.04.3+14.04.20140922-0ubuntu1) ...
Purging configuration files for unity-control-center (14.04.3+14.04.20140922-0ubuntu1) ...
Removing indicator-keyboard (0.0.0+14.04.20140410.1-0ubuntu1) ...
Removing unity (7.2.3+14.04.20140826-0ubuntu1) ...
Removing unity-greeter (14.04.10-0ubuntu1) ...
Purging configuration files for unity-greeter (14.04.10-0ubuntu1) ...
Removing liblightdm-gobject-1-0 (1.10.3-0ubuntu2) ...
Purging configuration files for liblightdm-gobject-1-0 (1.10.3-0ubuntu2) ...
Removing lightdm (1.10.3-0ubuntu2) ...
Purging configuration files for lightdm (1.10.3-0ubuntu2) ...
Removing user `lightdm' ...
Warning: group `lightdm' has no more members.
userdel: user lightdm is currently used by process 1293
/usr/sbin/deluser: `/usr/sbin/userdel lightdm' returned error code 8. Exiting.
dpkg: error processing package lightdm (--purge):
 subprocess installed post-removal script returned error exit status 1
Processing triggers for libglib2.0-0:i386 (2.40.2-0ubuntu1) ...