Description of problem:

Upgrading F15 to F16 using preupgrade-cli, after reboot and all packages installation got error message:

CRIT anaconda: anaconda 16.25 exception report
Traceback (most recent call first)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/bootloader.py", line 2053, in writeBootloader
    log.info("bootloader stage1 target device is %s" % stage1_device.name)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/dispatch.py", line 373, in dispatch
    self.dir = self.steps[self.step].target(self.anaconda)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/dispatch.py", line 241, in go_forward
     self.dispatch()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/gui.py", line 1201, in nextClicked
     self.anacaonda.dispatch.go_forward()
  ...

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


How reproducible:


Steps to Reproduce:
1. start preupgrade-cli
2. boot image and packages downloaded - Ok
3. reboot
4. installation (upgrade) started
5. all packages installed successfully
6. at the end, window with error message and 3 buttons (Debug, Save, Exit) appears
7. choose Save
8. Network configuration prompt appears
9. wireless network configured
10. window appears again
11. click 'Save' - #10 again
12. selected 'Exit' - got consoles
  - boot
  - shell
  - error messages output

Actual results:


Expected results:


Additional info: