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This question already has an answer here:

How can I change the waiting time of the dual boot menu (starting moment) into my Ubuntu Studio 15.10 installation? Can I?

marked as duplicate by Eric Carvalho, Eliah Kagan, ravery, Charles Green, karel Dec 6 '17 at 6:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Open a terminal window, then back up the existing grub config file:

sudo cp /etc/default/grub /etc/default/grub-backup

Now (using sudo or gksudo depending on your editor of choice) edit /etc/default/grub and change the number in this line of the file

GRUB_TIMEOUT=10

to your desired waiting time in seconds.

Exit, saving the file, and then run

sudo update-grub

On your next boot you should have the wait time you specified.

  • Creating a backup of grub file is a very good idea to recover from a messed up situation. Btw, I required root privileges to edit the grub file else it was giving access denied error as mentioned here – RBT Dec 6 '17 at 0:02
  • Thanks for pointing that out! I have edited the answer to fix that. – Organic Marble Dec 6 '17 at 0:13

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