Forcing Grub to display menu at boot time

Posted: April 7, 2012 in Technology
Tags: , , , ,

in Dual boot system, grub usually displays the menu at boot time by default but in case of single boot systems, this is generally not displayed. I just compiled a kernel and added the entry in grub also but while booting, grub menu was not displayed and I could not boot into the older kernel. To force grub to display the boot menu during boot time, edit the /etc/defaults/grub file and comment out the following statement
GRUB_HIDDEN_TIMEOUT=0
by changing it to
#GRUB_HIDDEN_TIMEOUT=0
Now to modify the time for this menu should be displayed during boot by editing the value of GRUB_TIMEOUT. In my case default was
GRUB_TIMEOUT=10
which I changed to
GRUB_TIMEOUT=5
to display the menu for 5 seconds.
now update the grub :
update-grub
Next boot you will be able to see the menu.

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Comments
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