Bug#767682: still happens in d-i 20150606

[Joseph Valles]

Confirming that the live stable installer 
"debian-live-8.1.0-amd64-cinnamon-desktop.iso" hangs during partitioning when 
installing to a drive with a preexisting msdos partition table with grub in 
/boot from a previous installation. Overwriting the first 200MB of the device 
allows the installer to work normally.
Posting from Debian 8.1.0 Cinnamon