dpkg --configure --pending
Setting up at (3.1.10ubuntu4) ...
 * Starting deferred execution scheduler atd                                    invoke-rc.d: initscript atd, action "start" failed.
dpkg: error processing at (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of ubuntu-standard:
 ubuntu-standard depends on at; however:
  Package at is not configured yet.
dpkg: error processing ubuntu-standard (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 at
 ubuntu-standard