Just updated a personal server
The installer somehow trashed the apt dependency tracking so it spewed errors, said my computer was in an inconsistent state, then the system crashed. Thanks! Some time in the console got the installation resuming. After that, I noticed that live services had their configuration files significantly changed. It wasn't secure at all and I cleaned up as fast as I could. AT&T even sent me an email saying unsafe ports were open. The installer should have turned off every service that received major configuration updates but it left them on. The worst was Samba. Samba was supposed to offer only encrypted CIFS, and it was set to all interfaces. The update turned on all the DNS junk while Samba was still on all interfaces.