![]() ![]() Sudo umount /mnt/boot #Only if you mounted it earlierĪnd then reboot, hopefully your Grub menu will be restored. Unmount the filesystems: sudo umount /mnt/dev 1 I'm running Linux Mint 21.1 Xfce and it was all good up to and including 5.15.0-60-generic but after updating to -67 I started getting an 'out of memory' error at boot (hit any key) followed by 'kernel panic, not syncing, VFS unable to mount rootfs on unknown block'. mod files, it means that this is NOT the correct boot directory, look above for how to mount a separate boot partition. mod files and grub.cfg, the latter should have entries for your Ubuntu kernels. Grub will always try to put the highest kernel number on top of the list and use it as the default kernel to boot, unless the user enters the Grub menu during startup and explicitly selects a different kernel from the list and boots it. For this, cd /mnt/boot/grub and check that grub's files are there, there should be a bunch of. This should rebuild your /boot/grub/grub.cfg file with the menu entries.Īt this point you may want to check that things were correctly updated. Once you've confirmed that /boot/ contains the correct files, meaning that it is the correct location, type: sudo update-grub Look above to see how to determine if you need to mount an additional boot directory. sound effect in my Linux OS (have tried it with Linux Mint 17, Fedora 20). If the directory is empty, don't continue, because it means this is NOT your actual boot directory. I am going to stay with this mainline kernel and Tow-Boot for the time being. Go to /boot/grub and look at the files there. First thing to do is confirm that you're using the correct /boot directory. Once these are mounted, do chroot to start using the mounted directory as the root partition: sudo chroot /mnt If you see an entry for /boot, note which device it is pointing to ( /dev/sda4 maybe?). Once you have your Ubuntu partition mounted, open /mnt/etc/fstab. My notes were from years ago.so I Re-wrote them for Mint Cinnamon 21.1 but will work for other Mints too. It's very handy to know how to roll back a Kernel.just in case. How can you tell if you have a boot partition? 1 Sometimes installing a new Kernel from the Update Manager could result in things not working correctly.this has only happened to me once years ago.lucky me. Then mount a few more directories that are needed: sudo mount -bind /dev /mnt/devĪlso, if you have a separate Ubuntu boot partition (pretty uncommon these days, but it may be the case): sudo mount /dev/sdaX /mnt/boot Let me know if you need help to do this: sudo mount /dev/sda5 /mnt I'm assuming the Ubuntu partition is /dev/sda5, but you should determine this yourself. Once it boots, open a terminal (ctrl-alt-t) and mount your Ubuntu partition on /mnt. To achieve this, you can use a Live CD, mount the relevant partitions from your hard disk, chroot into the mounted directory, and run update-grub, which should work as if you were operating on the actual hard disk.īoot with your Live CD, selecting "Try Ubuntu without installing". Since you say your grub bootloader appears, but the menu is empty, I think you don't need to reinstall grub, but rather, as you ask, run update-grub. Contents Secure Boot and Linux Mint 19 Installation of required tools Secure Boot setup GRUB EFI setup Prepare signed grub.cfg kernel and initrd on the EFI. ![]()
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