Enable grub menu:
edit the /etc/default/grub file and change the
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
to
GRUB_HIDDEN_TIMEOUT=10
GRUB_HIDDEN_TIMEOUT_QUIET=false
Save and call:
sudo update-grub
from a terminal, and reboot.
Enable grub menu UBUNTU
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