[root@anja:/etc/amavis]# apt-get install aptitude
Reading package lists... Done
Building dependency tree... Done
aptitude is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 79 not upgraded.
1 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Setting up amavisd-new (2.4.2-6.1) ...
Creating/updating amavis user account...
Starting amavisd: Found incompatible config file flag!
Due to safety concerns, amavisd-new will not be started.
Refer to /usr/share/doc/amavisd-new/README.Debian for instructions.
invoke-rc.d: initscript amavis, action "start" failed.
dpkg: error processing amavisd-new (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 amavisd-new
E: Sub-process /usr/bin/dpkg returned an error code (1)