Error to begin with, can't boot
I had to do a hard reboot of my computer, and when booting up it (initramfs I think) gave an error:
mount: mounting /dev/mapper/ubuntu--vg-root on /root failed: Invalid argument mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys on /root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or directory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg.
Trying to mount from Live-CD
I have very, very important data on it, so instead of trying to fix the boot system (or whatever I should call it), I would just like to mount it and copy the important files to a USB stick.
I have tried several guides without luck. The most straight forward seems to be Mount encrypted volumes from command line?. Here is what I've done:
ubuntu@ubuntu:~$ sudo cryptsetup luksOpen /dev/sda3 myvolume Enter passphrase for /dev/sda3: ubuntu@ubuntu:~$ mkdir mountpoint ubuntu@ubuntu:~$ sudo mount /dev/mapper/myvolume m mount: unknown filesystem type 'LVM2_member' ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/mapper/myvolume mountpoint mount: /dev/mapper/myvolume already mounted or mountpoint busy
The mountpoint folder is not busy, it's an empty folder that I can delete if I want. I believe
/dev/mapper/myvolume is not mounted, well since I have not done it, and since the following returns nothing
ubuntu@ubuntu:~$ mount -l | grep myvolume.
I don't know what information is relevant for the question. In my struggle I have learned the names of dozens of new commands, and it would be too much text to post the information from all of them. So please tell me what additional information is relevant.
Output of blkid
/dev/loop0: TYPE="squashfs" /dev/sda1: UUID="04BD-5CB0" TYPE="vfat" /dev/sda2: UUID="4b4af9b9-1290-431a-bfcb-3b8e24d52c54" TYPE="ext2" /dev/sda3: UUID="09e172eb-1080-4f68-80fb-1386ac0491b6" TYPE="crypto_LUKS" /dev/sdb1: UUID="369D-508C" TYPE="vfat" /dev/mapper/myvolume: UUID="0DkUPe-3S13-zNOA-5wi0-uzPb-CCB8-9m14C1" TYPE="LVM2_member" /dev/mapper/ubuntu--vg-swap_1: UUID="44b26e6d-cb85-4949-b0e8-9421ab515d03" TYPE="swap"
Complete summary from Ubuntu Boot-Repair
I did not try to restore anything, I only used the tool to print a summary of relevant information. Tool used: https://help.ubuntu.com/community/Boot-Repair
Result: https://www.jottit.com/gvwbu/ (many pages)