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How do I show the GRUB menu in GRUB 2 during boot up?

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You can get to the Grub 2 menu by holding the Shift key down on startup and not letting it go until the menu appears.

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If you want to enable the menu by default, check the line GRUB_HIDDEN_TIMEOUT in the file /etc/default/grub. This option does the following:

Wait this many seconds for a key to be pressed before displaying
the menu.  If no key is pressed during that time, display the menu
for the number of seconds specified in GRUB_TIMEOUT before booting
the default entry. We expect that most people who use
GRUB_HIDDEN_TIMEOUT will want to have GRUB_TIMEOUT set to `0' so
that the menu is not displayed at all unless a key is pressed.
Unset by default.

As you see it is unset by default, so check whether it has been set or not in your case.

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