This document belongs to Manual Full System Encryption (with Extras).

1. Support

If you hit a problem that this troubleshooting guide doesn't help, you can ask for support. In all cases, it might be helpful to point to these instructions so that people know what you are trying to do.

• The Ubuntu Forums is a friendly and welcoming place, with a section just for beginners, or you might prefer the section for Installation and Upgrades.

• Ask Ubuntu, a member of StackExchange, is a no-nonsense Q&A site for Ubuntu-related questions.

2. Computer fails to boot after upgrade or new installation

On rare occasions, you might find that the computer fails to boot. This can happen if Windows makes a major (not necessarily large) update, or if Grub becomes corrupted in some other way.

1. Boot into a Live CD.

2. Check your keyboard.

3. Open a terminal.

4. To unlock your partition, enter the following command. Replace /dev/PARTITION with your system partition, e.g. /dev/sda5 or /dev/nvme01n1p5. You will be prompted for your system passphrase.

   •     sudo cryptsetup open --type=luks /dev/PARTITION system

5. Mount your system partition. Replace /dev/PARTITION with your EFI System Partition (ESP), e.g. /dev/sda2 or /dev/nvme01n1p2.

   •     sudo mkdir /mnt/root
         sudo mount /dev/mapper/system-root /mnt/root
         sudo mount /dev/mapper/system-boot /mnt/root/boot
         sudo mount /dev/PARTITION /mnt/root/boot/efi

6. Enter something called chroot (don't worry about what it means).

   •     sudo mount --bind /dev /mnt/root/dev
         sudo mount --bind /run /mnt/root/run
         sudo chroot /mnt/root
         mount --types=proc proc /proc
         mount --types=sysfs sys /sys

7. Fix Grub. This might take a couple of minutes to run.

   •     refreshgrub

8. Enter the following command.

   •     exit

9. Close all open windows, and reboot your computer.

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