I recently encountered (and resolved!) an error upgrading a machine to Fedora 7. I reasoned it was worth sharing, so here you go:
Early in the process, an Anaconda screen prompted me to decide between a full install (to overwrite the existing FC6) or an upgrade. After I chose “upgrade,” the installer choked with this stack trace:
Traceback (most recent call first):
File "/usr/lib/anaconda/iw/upgrade_bootloader_gui.py", line 78, in _newToLibata
if l.strip() == "#":
File "/usr/lib/anaconda/iw/upgrade_bootloader_gui.py", line 90, in getScreen
newToLibata = self._newToLibata(anaconda.rootPath)
File "/usr/lib/anaconda/gui.py", line 1131, in setScreen
new_screen = self.currentWindow.getScreen(anaconda)
File "/usr/lib/anaconda/gui.py", line 1042, in nextClicked
IndexError: string index out of range
I dug deeper in the stack trace and found the culprit: Anaconda didn’t like that the system’s /etc/modprobe.conf began with comment lines. I removed those, restarted the upgrade, and it went off without a hitch.
Hopefully this will spare you a headache or two.