Manjaro disappeared from BIOS and Grub

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Then I’m guessing you’ll need to chroot into the installation and reinstall GRUB from there:

To enter a chroot environment

  1. Ensure you’ve got a relatively new ISO or at least one with a still supported LTS kernel.

  2. Write/copy/dd the ISO to a USB thumb drive.

  3. When done, boot with the above mentioned USB thumb drive into the live environment.

  4. Once booted, open a terminal and enter the following command to enter the chroot environment:

manjaro-chroot -a

If you have more than one Linux installation, select the correct one to use from the list provided.

If sucessfully done, you should now be in the chroot environment.

But, be careful, as you’re now in an actual root environment oon your computer, so any changes you make will persist after a restart and can cause damage.

Reinstalling grub from chroot environment.

Once in the chroot environment, you have to reinstall GRUB. To do so, run the following:

update-grub

When successfully completed, exit the chroot environment:

exit

Followed by rebooting and seeing if it worked.

If it did, feel free to heap on the praise. If, however, it didn’t, well, then I’m not here.

If this doesn’t work, then I really don’t know and we’ll have to hope someone more knowledgeable than I comes along.

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