I have a dual-boot system with grub as selection application. This setup does not work to select the OS of choice, because the Bluetooth keyboard is not (yet) paired, and therefore I cannot use the cursor keys.
1. Is it eventually possible to do this with grub?
The device has a touch screen. Alas, it doesn't work either for grub, though it does at an earlier boot stage (UEFI), and sometimes touching the grub screen pops up something like a blue onscreen keyboard for some 1/5th of a second. But never long enough to do anything except of watching it disappear again.
Can anyone suggest what I can do to switch to another OS at boot time except of carrying a USB-keyboard for just this purpose?