xrandr --output VGA1 --rotate left
to not hurt my head + neck - except when it boots or in the BIOS.
If it complains about a missing bits/predefs.h in building anything, go back and install libc6-dev
sudo apt-get install gcc-multilib libc6-i386 lib6-dev-i386
Of all the fractured X11 GUI nonsense in Linux atm, I really don´t know which one I got in Linux Mint - other than its some variant of GNOME 3. I guess that I don´t care means it works better than Ubuntu unity...