ubuntu@ubuntu:~$ sudo mount /dev/sdb5 /mnt
mount: unknown filesystem type 'crypto_LUKS'
ubuntu@ubuntu:~$ sudo cryptsetup luksOpen /dev/sdb5 ubuntu_root
Enter passphrase for /dev/sdb5: 
ubuntu@ubuntu:~$ cd  /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d; mount /dev/sdb1 boot
mount: only root can do that
ubuntu@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d$ sudo -i
root@ubuntu:~# cd  /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d; mount /dev/sdb1 boot
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo mount /dev/sdb1 /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/boot
mount: /dev/sdb1 is already mounted or /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/boot busy
       /dev/sdb1 is already mounted on /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/boot
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo mount --bind /dev /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/dev
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo mount --bind /dev /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/dev
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0aroot@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo mount --bind /proc /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/proc
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo mount --bind /sys /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/sys
root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo chroot /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/
root@ubuntu:/# apt-get install linux-image-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
linux-image-generic is already the newest version.
The following packages were automatically installed and are no longer required:
  linux-image-3.13.0-34-generic linux-image-extra-3.13.0-34-generic
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 277 not upgraded.
root@ubuntu:/#