Computer and IT knowledge - things to know
$ sudo vi /etc/default/grub
#check this settings, especially if the STYLE is set to hidden > change it to menu!
GRUB_TIMEOUT_STYLE=hidden -> GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=0 -> GRUB_TIMEOUT=10
after changes run $ sudo update-grub
$ reboot
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