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Bluetooth keyboard or at least touchscreen for grub

From: Uwe Dippel
Subject: Bluetooth keyboard or at least touchscreen for grub
Date: Sat, 6 Apr 2019 20:11:40 +0100

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?

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