Well I had tried to just upgrade my system using "preupgrade" and here's the error message I'm getting, don't know if it's related to the same problem you're having.

bash-4.2# preupgrade
No protocol specified
Traceback (most recent call last):
  File "/usr/share/preupgrade/preupgrade-gtk.py", line 53, in <module>
    import gtk
  File "/usr/lib/python2.7/site-packages/gtk-2.0/gtk/__init__.py", line 64, in <module>
    _init()
  File "/usr/lib/python2.7/site-packages/gtk-2.0/gtk/__init__.py", line 52, in _init
    _gtk.init_check()
RuntimeError: could not open display
bash-4.2#



EGO II


On 06/20/2012 12:54 AM, David Lam wrote:
I'm trying to upgrade my F15 system using the F17 installation DVD, but it's failing with this error right at the start of the screen where it starts to install/upgrade packages and has the progress bar.  I did the verify install disk thing and it said it was fine too.

I'm not too sure what I should try next or check. Anyone get this before or have any ideas?

I did a little reading and found preupgrade here http://fedoraproject.org/wiki/PreUpgrade, so... maybe I'll give it a try.