Today i upgraded Ubuntu Server 6 LTS to Ubuntu Server 8 LTS. The network upgrade worked perfect! Afterward i reinstalled ISPConfig because it's wasn't functioning properly. When reinstalling ISPConfig it stopped after a while with the announcement ISPConfig will not work with the installed version.
To bad, have to wait for an ISPConfig release that works with the new Ubuntu LTS 8 server.
Just wanted to warn the rest before you have to restore from backup