dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  ureadahead -> ureadahead
 packages' pending triggers which are or may be unresolvable:
  cups: /usr/share/cups/ppd-updaters
  ureadahead: /etc/init: /etc/init.d
  gconf2: /usr/share/GConf/gsettings
dpkg: error processing package cups (--configure):
 triggers looping, abandoned
dpkg: ../../src/packages.c:226: process_queue: Assertion `dependtry <= 4' failed.
E: Sub-process /usr/bin/dpkg exited unexpectedly