Decrypt and mount encrypted volume
sudo su
apt install cryptsetup
cryptsetup luksOpen /dev/sda1 my_encrypted_volume
# enter password
mount /dev/mapper/my_encrypted_volume /mntUnmount and detach mounted encrypted volume
umount -R /mnt
# deactivate all logical volumes - otherwise will get "still in use" errors
lvchange -an my_encrypted_volume
cryptsetup luksClose my_encrypted_volumeEOF