I need to add the boot parameter
foo=bar to my kernel. How can I do this once for testing, and permanently if testing was a success?
To temporarily add a boot parameter to a kernel
- Start your system and wait for the GRUB menu to show (if you don't see a GRUB menu, press and hold the left Shift key right after starting the system).
- Now highlight the kernel you want to use, and press the e key. You should be able to see and edit the commands associated with the highlighted kernel.
- Go down to the line starting with
linuxand add your parameter
foo=barto its end.
- Now press Ctrl + x to boot.
To make this change permanent
From a terminal (or after pressing Alt + F2) run:
gksudo gedit /etc/default/grub
geditare not available) and enter your password.
Find the line starting with
foo=barto its end. For example:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash foo=bar"
Save the file and close the editor.
Finally, start a terminal and run:
to update GRUB's configuration file (you probably need to enter your password).
On the next reboot, the kernel should be started with the boot parameter. To permanently remove it, simply remove the parameter from
GRUB_CMDLINE_LINUX_DEFAULT and run
sudo update-grub again.
To verify your changes, you can see exactly what parameters your kernel booted with by executing
2Shift doesn’t work for me. I used Esc instead. Had to be careful not to hold it too long or it would blow right through GRUB– eqzxJul 7, 2018 at 3:18
gksudois no longer in Ubuntu. Use
pkexecinstead.– TerranceJun 27, 2019 at 14:12
2Shift doesn't work when booting in UEFI mode, apparently. There, you have to press Esc repeatedly, but stop once you get to the GRUB menu or it'll drop to the GRUB shell. Dec 16, 2019 at 9:20
To add any kernel option:
for a liveCD session: follow these steps
for an Existing Installation: use Boot-Repair's
Add a kernel optionor
Edit GRUB configuration fileoptions.
See also this documentation.
Alternatively, you may also use the handy grub-customizer:
sudo add-apt-repository ppa:danielrichter2007/grub-customizer sudo apt-get update sudo apt-get install grub-customizer gksu grub-customizer &
Just open a boot entry, and edit its kernel parameters as highlighted in the screenshot below: