grub wait time to 0

raven4d · 01-14-2018, 11:55 AM

Hello friends

i have a dual boot computer Linux with windows

stupid me ,i played with grub configurations and sat the waiting time to 0 and the default option to windows , thinking that i can still go to linux if holded some arrow ( which is obviously stupidtly wrong )

now i cant go into my main OS which was linux ... any help will be appreciated ..

i can easly boot the system from usb having some linux rescue distro and edit the grub config again , but after i edit the cong . i need to run grub-update so GRUB is updated .. and this is what am not managing to do till now ..

hydrurga · 01-14-2018, 12:04 PM

Try holding down the Shift key while the machine is booting up. This should show the Grub menu.

jsbjsb001 · 01-14-2018, 12:05 PM

You'll need to mount your Linux "root" partition and edit the following file:

(The setting in bold is the setting you need to change.)

Code:

[root@localhost /]# cat /etc/default/grub 
GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto"
GRUB_DISABLE_RECOVERY="true"

raven4d · 01-14-2018, 01:36 PM

Quote:

Originally Posted by hydrurga

Try holding down the Shift key while the machine is booting up. This should show the Grub menu.

thanks ! but i read that before , and tried every possible timing to start pressing shift .. with no results ..

raven4d · 01-14-2018, 01:37 PM

Quote:

Originally Posted by jsbjsb001

You'll need to mount your Linux "root" partition and edit the following file:

(The setting in bold is the setting you need to change.)

Code:

[root@localhost /]# cat /etc/default/grub 
GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto"
GRUB_DISABLE_RECOVERY="true"

this i tried to do ( it was how i changed my GRUB conf in the first place ) but after editing the file i need to issue the command (grub-update) for grub changes to take effect ..

jsbjsb001 · 01-14-2018, 02:01 PM

Yes, you do need to update the GRUB configuration file, after editing that file. It would help if you told us which Linux distribution your using.

Also, download the "Super GRUB disk" and boot your machine from that and then run the command, to update the GRUB configuration file.

raven4d · 01-14-2018, 02:44 PM

Quote:

Originally Posted by jsbjsb001

Yes, you do need to update the GRUB configuration file, after editing that file. It would help if you told us which Linux distribution your using.

Also, download the "Super GRUB disk" and boot your machine from that and then run the command, to update the GRUB configuration file.

Super GRUB disk did the trick !

thanks for saving my Linux

yancek · 01-15-2018, 05:54 PM

In a situation like this, you can use a Live CD/USB to mount the partition with the /boot/grub/grub.cfg file and change the line near the top: set timeout=10
If you then reboot, you should see the Grub menu for 10 seconds with your options. If you want this permanent, you need to edit the file /etc/default/grub as explained above and then run sudo update-grub. This way, you will not have to chroot and run update-grub. If SuperGrubDisk takes care of this, probably easier.