script: ensure this script is launched from the right dir
script: no need to use dbus-launch, we no longer use it
script: workaround DBus: automatically launched it from a new terminal: it doesn't work...

=> Manual step with instructions
NVidia Prime: enable the option by default if we detect 2 video cards with >= 1 Nvidia

instead of proposing an option and not install it if we don't detect that
script: install_packages.sh + check_packages.sh: move to $DIR/matttbe

instead of /tmp/matttbe
script: install: if error: added '==='