Comment 5 for bug 555881

Exception during installation:
Apr 5 17:32:24 ubuntu python: Traceback (most recent call last):
Apr 5 17:32:24 ubuntu python: File "/usr/share/ubiquity/install.py", line 2430, in <module>
Apr 5 17:32:24 ubuntu python: install.run()
Apr 5 17:32:24 ubuntu python: File "/usr/share/ubiquity/install.py", line 400, in run
Apr 5 17:32:24 ubuntu python: self.configure_bootloader()
Apr 5 17:32:24 ubuntu python: File "/usr/share/ubiquity/install.py", line 1605, in configure_bootloader
Apr 5 17:32:24 ubuntu python: self.db.input('critical', bootdev)
Apr 5 17:32:24 ubuntu python: File "/usr/lib/python2.6/dist-packages/debconf.py", line 65, in <lambda>
Apr 5 17:32:24 ubuntu python: lambda *args, **kw: self.command(command, *args, **kw))
Apr 5 17:32:24 ubuntu python: File "/usr/lib/python2.6/dist-packages/debconf.py", line 86, in command
Apr 5 17:32:24 ubuntu python: status = int(status)
Apr 5 17:32:24 ubuntu python: ValueError: invalid literal for int() with base 10: ''
Apr 5 17:32:24 ubuntu python: