Selecting 'upgrade system' (on a disk containing a debian potato
installation) gives the python traceback:

Traceback (innermost last):
  File "/usr/lib/anaconda/gui.py" line 176 in run 
    mainloop()
  File "/usr/lib/python1.5/site-packages/gtk.py", line 2538 in mainloop
    _gtk.gtk_main()
  File "/usr/lib/python1.5/site-packages/gtk.py", line 125 in __call__ 
    ret = apply(self.func, a)
  File "/usr/lib/anaconda/gui.py", line 408, in nextClicked 
    next = self.currentScreen.getNext()
  File "/usr/lib/anaconda/iw/examine_gui.py", line 21, in getNext
    self.todo.upgradeFindPackages (self.root)
  File "/usr/lib/anaconda/todo.py", line 771, in upgradeFindPackages
    fstab.readFstab('/mnt/sysimage/etc/fstab', self.fstab)
  File "/usr/lib/anaconda/fstab.py", line 913, in readFstab
    if fields[0] == "#" and fields[1][0:4] == "LOOP":
IndexError: list index out of range

After clicking OK in the python traceback dialog, the system reboots (it
should get back to the upgrade/install selection, no ?).

The fstab in question contains:
# /etc/fstab: static filesystem information.
#
# <file system> <mount point>	<type>	<options>	<dump>	<pass>
/dev/hda2	/		ext2	defaults,errors=remount-ro	0	1
/dev/hda1	none		swap	sw		0	0
proc		/proc		proc	defaults	0	0
/dev/fd0	/floppy		auto	defaults,user,noauto	0	0
/dev/cdrom	/cdrom		iso9660	defaults,ro,user,noauto	0	0

Stelian.