My ubuntu 18.04 won’t load after recent update

I'm trying to fix my hard drive.
It's an encrypted hard drive.
I'm using a live CD.
And I'm using a MacBook Pro.

Reinstall the GRUB of sda1 into the MBR of sda chroot: cannot change root directory to 'grub-install': No such file or directory grub-install /dev/sda: exit code of grub-install /dev/sda:125

---- Grub-install verbose

chroot: cannot change root directory to 'sh': No such file or directory

/usr/sbin/grub-install /dev/sda: exit code of grub-install /dev/sda:125 ---- End of grub-install verbose

chroot update-grub chroot: cannot change root directory to 'update-grub': No such file or directory umount: /proc: target is busy. umount: /dev/pts: target is busy. umount: /dev: target is busy. mount: /mnt/boot-sav/sda3: unknown filesystem type 'crypto_LUKS'. mount /dev/sda3 : Error code 32 mount -r /dev/sda3 /mnt/boot-sav/sda3 mount: /mnt/boot-sav/sda3: unknown filesystem type 'crypto_LUKS'. mount -r /dev/sda3 : Error code 32

An error occurred during the repair.

You can now reboot your computer.​