Монтирование раздела Luks

ИСХОДНОЕ СООБЩЕНИЕ:

Я резервировал диск со всеми его разделами с помощью команды

dd if=/dev/sda of=/media/oshirowanen/external-drive/backups-2019/ubuntu.img 

/dev/sda ssd, которому установили Ubuntu 18.04 с полным шифрованием.

Прежде чем я буду вытирать этот диск и повторно иметь целью его, я хочу удостовериться, что резервное копирование работало.

Я попробовал следующее путем поиска askubuntu и другие stackexchange сайты:

sudo losetup -P /dev/loop0 /media/oshirowanen/external-drive/backups-2019/ubuntu.img 
[sudo] password for oshirowanen: [password goes here]
losetup: /media/oshirowanen/external-drive/backups-2019/ubuntu.img: failed to set up loop device: Device or resource busy

sudo losetup -P /dev/loop100 /media/oshirowanen/external-drive/backups-2019/ubuntu.img 
sudo cryptsetup luksOpen /dev/loop100p5 img5
Enter passphrase for /dev/loop100p5: [password goes here]

cd /mnt
mkdir img5
sudo mount /dev/mapper/img5 img5
mount: /mnt/img5: unknown filesystem type 'LVM2_member'.

Что я делаю неправильно? Оба cryptsetup и lvm2 уже установлены.

Если это не лучший способ резервировать диск, предложите что-то еще, что лучше.

ОБНОВЛЕНИЕ 1:

oshirowanen@desktop:~$ sudo pvscan
[sudo] password for oshirowanen: 
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: Disabling lvmetad cache which does not support duplicate PVs.
  WARNING: Not using lvmetad because duplicate PVs were found.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 prefers device /dev/mapper/sda5_crypt because device is used by LV.
  PV /dev/mapper/sda5_crypt   VG ubuntu-vg       lvm2 [232.16 GiB / 0    free]
  Total: 1 [232.16 GiB] / in use: 1 [232.16 GiB] / in no VG: 0 [0   ]
oshirowanen@desktop:~$ sudo vgscan
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: Disabling lvmetad cache which does not support duplicate PVs.
  WARNING: Not using lvmetad because duplicate PVs were found.
  Reading all physical volumes.  This may take a while...
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 prefers device /dev/mapper/sda5_crypt because device is used by LV.
  Found volume group "ubuntu-vg" using metadata type lvm2
oshirowanen@desktop:~$ sudo vgs
  WARNING: Not using lvmetad because duplicate PVs were found.
  WARNING: Use multipath or vgimportclone to resolve duplicate PVs?
  WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 prefers device /dev/mapper/sda5_crypt because device is used by LV.
  VG        #PV #LV #SN Attr   VSize   VFree
  ubuntu-vg   1   2   0 wz--n- 232.16g    0 
oshirowanen@desktop:~$ sudo lvs
  WARNING: Not using lvmetad because duplicate PVs were found.
  WARNING: Use multipath or vgimportclone to resolve duplicate PVs?
  WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 on /dev/mapper/img5 was already found on /dev/mapper/sda5_crypt.
  WARNING: PV udJ9tW-vls3-YQOz-cLkW-lTsh-DMCF-zrfLD0 prefers device /dev/mapper/sda5_crypt because device is used by LV.
  LV     VG        Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   ubuntu-vg -wi-ao---- <231.21g                                                    
  swap_1 ubuntu-vg -wi-ao----  980.00m                                                    
oshirowanen@desktop:~$ ls /dev/mapper/
control  img5  sda5_crypt  ubuntu--vg-root  ubuntu--vg-swap_1
oshirowanen@desktop:~$ 

ОБНОВЛЕНИЕ 2:

ubuntu@ubuntu:~$ sudo losetup -P /dev/loop100 /media/ubuntu/external-drive/backups-2019/ubuntu.img 
ubuntu@ubuntu:~$ sudo cryptsetup luksOpen /dev/loop100p5 img5
Enter passphrase for /dev/loop100p5: 
ubuntu@ubuntu:~$ cd /mnt
ubuntu@ubuntu:/mnt$ sudo mkdir img5
ubuntu@ubuntu:/mnt$ sudo mount /dev/mapper/img5 img5
mount: /mnt/img5: unknown filesystem type 'LVM2_member'.
ubuntu@ubuntu:/mnt$ sudo pvscan
  PV /dev/mapper/img5   VG ubuntu-vg       lvm2 [232.16 GiB / 0    free]
  Total: 1 [232.16 GiB] / in use: 1 [232.16 GiB] / in no VG: 0 [0   ]
ubuntu@ubuntu:/mnt$ sudo vgscan
  Reading volume groups from cache.
  Found volume group "ubuntu-vg" using metadata type lvm2
ubuntu@ubuntu:/mnt$ sudo vgs
  VG        #PV #LV #SN Attr   VSize   VFree
  ubuntu-vg   1   2   0 wz--n- 232.16g    0 
ubuntu@ubuntu:/mnt$ sudo lvs
  LV     VG        Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   ubuntu-vg -wi-a----- <231.21g                                                    
  swap_1 ubuntu-vg -wi-a-----  980.00m                                                    
ubuntu@ubuntu:/mnt$ ls /dev/mapper/
control  img5  ubuntu--vg-root  ubuntu--vg-swap_1
ubuntu@ubuntu:/mnt$