root@ncg-1560:/home/joachim# apt-get install firefox
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  fonts-lyx
The following packages will be upgraded:
  firefox
1 upgraded, 0 newly installed, 0 to remove and 411 not upgraded.
Need to get 0 B/41.2 MB of archives.
After this operation, 6203 kB of additional disk space will be used.
dpkg: unrecoverable fatal error, aborting:
 unknown group 'crontab' in statoverride file
E: Sub-process /usr/bin/dpkg returned an error code (2)