New Updates are in the queue. how can i make sure that installing them will end in a functioning system? The following packages will be upgraded: postfix postfix-doc postfix-mysql 3 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 2232kB of archives. After this operation, 225kB disk space will be freed. Do you want to continue [Y/n]? n Abort. I dont like it too much to install updates on a productive running system ;D