This is solved with the new updates ! \o/I am quite sure this was due to #1079022 but anyway here is a procedure to get everything working:
1. Create a debian netinst USB key. 2. Boot on it on your computer 3. Choose "Advanced options > Rescue mode" 4. Get everything in shape and get a shell on the root volume (the one mounted on '/') 5. Perform an 'apt-get update' and 'apt-get upgrade' Happy hacking to all ! Regards -- Emmanuel Fleury