I did an upgrade from CD of a 6.1 installation to 6.2. The video card was an ATI XPert99 (Rage 128), so I was using XF86_FBDev and I had a VGA=791 line in lilo.conf. The installer correctly upgraded XF86_FBDev, but reinstalled LILO without the VGA=791 line. The machine came up and kept tyring to start the X Server unsucessfully. The installer should pay very careful attention to /etc/lilo.conf for things like this, as well as other things like boot passwords. WORKAROUND: At the LILO: prompt, type "linux 3" to bring the system up in text mode. Log in as root, run "setup" and choose X Configuration. It will then detect the video card and install the correct XServer, and no longer need the framebuffer. Type "init 5" to bring the machine all of the way up.
The old lilo.conf is backed up to lilo.conf.rpmsave, so you can always flip over at the end of the installation and make the appropriate changes. We should have this resolved in the next cut of the installer. *** This bug has been marked as a duplicate of 10390 ***