Description of problem: While using preupgrade to migrate to FE-12 from FE-11 process gets to reboot with errors and will not complete install


Version-Release number of selected component (if applicable):


How reproducible:  Everytime


Steps to Reproduce:
1.run preupgrade on FE-11
2. select FE-12
3. Reboot when instructed
  
Actual results:
System reports some errors and after reboot does not continue with upgrade as expected.

Expected results:


Additional info:


[root@BRSINC-GS01 admin]# preupgrade
/usr/lib/python2.6/site-packages/yum/__init__.py:203: UserWarning: Use .preconf instead of passing args to _getConfig
  warnings.warn('Use .preconf instead of passing args to _getConfig')
Loaded plugins: blacklist, refresh-packagekit, whiteout
preupgrade-main (mirrorlist) 
  url: http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-12&arch=$basearch
  now: http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-12&arch=i386
preupgrade (mirrorlist) 
  url: http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/12/Fedora/$basearch/os
  now: http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/12/Fedora/i386/os
preupgrade-adobe-linux-i386 (baseurl) 
  url: http://linuxdownload.adobe.com/linux/i386/
  now: http://linuxdownload.adobe.com/linux/i386/
preupgrade-fedora (mirrorlist) 
  url: https://mirrors.fedoraproject.org/metalink?repo=fedora-12&arch=i386
  now: https://mirrors.fedoraproject.org/metalink?repo=fedora-12&arch=i386
unknown metadata being downloaded: metalink
preupgrade-updates (mirrorlist) 
  url: https://mirrors.fedoraproject.org/metalink?repo=updates-released-f12&arch=i386
  now: https://mirrors.fedoraproject.org/metalink?repo=updates-released-f12&arch=i386
preupgrade-updates-testing (mirrorlist) 
  url: https://mirrors.fedoraproject.org/metalink?repo=updates-testing-f12&arch=i386
  now: https://mirrors.fedoraproject.org/metalink?repo=updates-testing-f12&arch=i386
Traceback (most recent call last):
  File "/usr/share/preupgrade/preupgrade-gtk.py", line 240, in on_assistant_apply
    self._do_main()
  File "/usr/share/preupgrade/preupgrade-gtk.py", line 259, in _do_main
    self.main_preupgrade()
  File "/usr/share/preupgrade/preupgrade-gtk.py", line 436, in main_preupgrade
    download_progressbar=self.dnlProgress)
  File "/usr/lib/python2.6/site-packages/preupgrade/__init__.py", line 130, in setup
    self.complete_repo_setup()
  File "/usr/lib/python2.6/site-packages/preupgrade/__init__.py", line 328, in complete_repo_setup
    repo._grabfunc.opts.user_agent = __user_agent__
AttributeError: 'NoneType' object has no attribute 'opts'