Bug#606055: wheezy workaround

[Juri Grabowski <gratuxri@gmail.com>]

I have the same problem in Debian Wheezy debian-installer.
I was booting from PXE.
As workaround:

#Change the console
Alt + ->

#find out PID from udpkg
ps |grep udpkg|cut -d\  -f1

#kill this
kill $PID

#find out PID from network-preseed
ps |grep network-preseed

#kill it
kill $PID

#Continue your Installation
Alt + <-