I have found several forum posts and SE questions (example) where this seems possible, but my attempt has failed. I've tried the following:
sudo dpkg --add-architecture amd64sudo apt-get updatesudo apt-get install linux-image-3.13.0-54-generic:amd64sudo apt-get install gcc-multilibHowever, when I boot with the 64bit kernel, my keyboard and mouse don't work for some reason (terminal or X). Also, the X login screen resolution is wrong, but I guess that's because I'd need to install 64bit NVIDIA drivers for the new kernel. I also don't see any obvious errors in syslog, although it's shorter than regular 32bit boot.
I'm basically trying to do this becasue I've received a 64bit game on Steam as a gift, and I'm running 32bit OS because wine games work (better) on 32 bits.
Is there a way to accomplish this without resorting to dual boot or reinstall?
