Ubuntu 16.04 не загружается после установки Ubuntu 18.04

Ubuntu Server 16.04.3 не загружается после того, как я установил Ubuntu Desktop 18.04.2 на внешний жесткий диск.
Пожалуйста, спасите мои данные ...

Я напишу как можно больше журнала.

[     3.685607] raid6: using algorithm sse2x4 gen() 6246 MB/s
[     3.687221] raid6: .... xor() 4909 MB/s, rmw enabled
[     3.688848] raid6: using ssse3x2 recovery algorithm
[     3.694341] xor: measuring software checksum speed
[     3.732008]    prefetch64-sse:  8862.000 MB/sec
[     3.772007]    generic_sse:  7853.000 MB/sec
[     3.773559] xor: using function: prefetch64-sse (8862.000 MB/sec)
[     3.778353] async_tx: api initialized (async)
done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ...   lvmetad is not active yet, using direct activation during sysinit
  lvmetad is not active yet, using direct activation during sysinit
done.
Begin: Running /scripts/local-premount ... [     4.378337] Btrfs loaded, crc32c=crc32c-generic
Scanning for Btrfs filesystems
done.
Begin: Will now check root file system ... fsck from util-linux 2.27.1
[/sbin/fsck.ext4 (1) -- /dev/mapper/ubuntu--vg-root] fsck.ext4 -a -C0 /dev/mapper/ubuntu--vg-root
/dev/mapper/ubuntu--vg-root has unsupported feature(s): metadata_csum
e2fsck: Get a newer version of e2fsck!
fsck exited with status code 8
done.
Warning: File system check failed but did not detected errors
[   10.463694] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null)
done.
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... mount: mounting /dev on /root/dev failed: No such file or directory
mkdir: can't create directory '/root/lib/': Read-only file system
Warning: No /lib/modules in target. cannot help.
done.
mount: mounting /run on /root/run failed: No such file or directory
run-init: opening console: No such file or directory
Target filesystem doesn't have requested /sbin/init.
run-init: opening console: No such file or directory
run-init: opening console: No such file or directory
run-init: opening console: No such file or directory
run-init: opening console: No such file or directory
run-init: opening console: No such file or directory
No init found. Try passing init= bootarg.
[   10.602472] hidraw: raw HID events driver (C) Jiri Kosina
[   10.606622] usbcore: registered new interface driver usbhid
[   10.608163] usbhid: USB HID core driver


BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1.4) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)