I have used Debian Linux for two years, most recently the seventh or so iteration of Version 5. I use the Gnome desktop and the Synaptic Package Manager, not the Update Manager, for updates because it's easier to build a log with the former.
In my most recent update, Synaptic stripped out all the xserver-xorg files—47 in all. I thought it peculiar but did not know enough to interfere. When I rebooted, the system told me I must install xserver or correct GDM configuration and restart.
Have I been hacked? Am I being tested by the Linux Illuminati? Or does it have something to do with the warning message I received at the end of the update-upgrade, attachedDebian_error_msg.png? And how do I go about reinstalling xserver? With Aptitude? I have tried running apt-get -f install, to no effect.
Thanks for any assistance.

aptitude or apt-get
No, I sincerely doubt you've been hacked. More likely some dependency got changed or removed or your mirror was slightly out of sync and Synaptic happily resolved the conflict by removing the offending packages. Probably something to do with the recent Debian 6 release and maybe something off in your sources.list. For example, if your sources.list referred to the repo as stable rather than the code name Lenny, it probably tried to upgrade you at least partially to the new current stable, Squeeze.

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