Last weekend I tried to upgrade my Debian Stable to testing. Everything went super until I tried to run startx. It returned command not found. I've been searching and thinking about it all week, but I can't seem to figure it out. At first I thought the x-server was borked, but it's there and loading. Then I tried fooling around with Gnome, but that seems to be OK too.

I know this can't be hard to fix, but I'm not sure where to look next. Any ideas?