Make grub2 safe last choice

To make grub2 remember your last choice you simply have to add 1 line to /etc/default/grub and edit one entry in this file:

GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true

Adding GRUB_SAFEDEFAULT=true makes grub safe your last choice and GRUB_DEFAULT=saved makes it use your last choice. In most cases you find something like GRUB_DEFAULT=0 in your file.

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