***   Schriftgröße Konsole einstellen
( https://forum.ubuntuusers.de/topic/schriftgroesse-konsole-einstellen/ )

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=640x480
#GRUB_GFXMODE=1400x1050

GRUB_GFXPAYLOAD_LINUX=keep

> sudo update-grub