maybe I should switch to FreeBSD or ubuntu...

I just upgraded one of my systems from FC4 to FC5. Now I can't login to the console except in failsafe mode. When I ssh into the system, I see:

$ ls
ls: error while loading shared libraries: librt.so.1: cannot open shared object file: No such file or directory

I figured out what was wrong today (5/22):

I had this in my ~/.bash_profile from some much earlier Java installation:

export LD_ASSUME_KERNEL=2.2.5

I commented out that line with LD_ASSUME_KERNEL, which apparently is no longer supported, and that fixed everything.