GRUB menu not coming up during system boot
Recent versions of GRUB have the timeout hidden. You can hold down left-shift during boot to bring the message up or edit your /boot/grub/grub.conf and remove hiddenmeu
and set the default to something like 10 seconds timeout=10
For grub2 edit the /etc/default/grub file and make the following changes:
#GRUB_HIDDEN_TIMEOUT=0
GRUB_TIMEOUT=10
NOTE: The # symbol will comment out the GRUB_HIDDEN_TIMEOUT and will enable the menu
After making the changes run sudo update-grub to apply the changes
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Matt
Updated on September 18, 2022Comments
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Matt over 1 year
My Dell system came with Win7. I installed Ubuntu 10.04 into an LVM encrypted partition with the /boot unecrypted on it's own partition. The PC boots directly to the Ubuntu decrypt screen with no option for choosing a new kernel or the Windows partition. I've attempted update-grub, but the GRUB menu is never presented and the Win7 installation is never detected. I'm guessing I installed GRUB incorrectly...any ideas on what and how I can correct? Thanks!
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mihi about 12 yearsmaybe the delay is too short? try holding esc while booting. if you can go to grub prompt and enter
chainloader (hd0,
and press tab, do you see your windows partition? If yes, complete the command with the partition number and)+1
and typeboot
to try to boot from it. If not, maybe you overwrote your Win7 when installing? -
Matt about 12 yearsI entered the commands and selected (hd0,3) - the partition with win7 on it - entered boot and it says BOOTMGR is missing. I'm guessing I overwrote my win7 bootloader?
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mihi about 12 yearsdepending on how many different Windows OSes you had before, it may not be obvious where your bootloader is sitting. maybe you overwrote the partition of another Windows OS that held the bootloader when installing Ubuntu?
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Matt about 12 yearsYes I unknowingly deleted the Win7 boot partition. I had to use GParted to create a new NTFS 150 MB partition just before the Win7 partition. I then set the Win7 partition boot flag (needed for Win7 Recovery Disk). I booted from the Win7 Recovery Disk and it detected my Win7 OS install and reinstalled the missing Win7 boot partition. I might have had to use bootrec /fixboot...I can't recall. It booted fine per your instructions, but still would not show up in GRUB menu. Somehow my 10.04 system did not have GRUB2. I installed it - ran update-grub2 and viola- my Win7 is now selectable from GRUB.
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Matt about 12 yearsshift worked - thank you. I don't have grub.conf but grub.cfg. I commented out hiddenmenu and set timeout to 20 seconds, but still the menu did not appear until I held down the left shift...
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rbeatt about 12 yearsOn Ubuntu you'll need to edit the /etc/default/grub file and change set GRUB_TIMEOUT=10 and put a # in front of theGRUB_HIDDEN_TIMEOUT line. Then run 'sudo update-grub' to apply these changes.