When I upgraded this morning, apache2 now fails to start. I end up with one apache2 process (instead of the number of children specified in conf) which doesn't accept any http connections. It also doesn't die when I try /etc/init.d/apache2 stop, and I'm forced to kill it manually.
Okay, I have more information. If I remove a virtual host that requires SSL, I'm able to start apache2 fine.
Another (possibly related?) problem is that suexec fails to work now. I get this message in the error log:
Warning: SuexecUserGroup directive requires SUEXEC wrapper. -- Bruce Z. Lysik <eldrik@logrus.com> http://quicksilver.trickynetwork.com