[Ubuntu] MapServer 6.4 on Ubuntu 12.04

[Worth Lutz]

Jerome,

I tried to update MapServer and also seem to have also updated apache2 from
the ppa at the same time. I wasn't watching what I was doing.

The apache2 update has broken apache. Luckily this is my sandbox server with
nothing that important on it.  :)

Is Apache2-v2.4 needed for the update to MapServer??

How do I revert the Apache installation? 

Worth