Trouble mounting LVM2 drive via USB

[Volker Wysk]

Am Mittwoch, den 15.07.2020, 09:32 -0700 schrieb Noah:
> HI there,
> 
> I am having issues (again) trying to mount an external LVM2 drive
> via 
> USB.  Any assistance is appreciate in advance.
> 
> noah at nuc2:~$ cat /etc/lsb-release
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=20.04
> DISTRIB_CODENAME=focal
> DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"
> noah at nuc2:~$ lsblk
> NAME              MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
> loop0               7:0    0    97M  1 loop /snap/core/9289
> loop1               7:1    0    55M  1 loop /snap/core18/1754
> loop2               7:2    0  10.1M  1 loop /snap/kubectl/1545
> loop3               7:3    0    55M  1 loop /snap/core18/1880
> loop4               7:4    0  10.1M  1 loop /snap/kubectl/1559
> loop5               7:5    0  29.8M  1 loop /snap/snapd/8140
> loop6               7:6    0  96.5M  1 loop /snap/core/9436
> loop7               7:7    0  71.3M  1 loop /snap/lxd/16044
> loop8               7:8    0    10M  1 loop /snap/helm/256
> loop10              7:10   0  30.3M  1 loop /snap/snapd/7777
> loop11              7:11   0  71.3M  1 loop /snap/lxd/16100
> sda                 8:0    0   1.9T  0 disk
> ├─sda1              8:1    0   512M  0 part /boot/efi
> └─sda2              8:2    0   1.9T  0 part /
> sdb                 8:16   0 931.5G  0 disk
> ├─sdb1              8:17   0   243M  0 part
> └─sdb5              8:21   0 465.5G  0 part
>    ├─pc--vg-root   253:0    0 461.7G  0 lvm
>    └─pc--vg-swap_1 253:1    0   3.8G  0 lvm
> noah at nuc2:~$ sudo apt-get install lvm2
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> lvm2 is already the newest version (2.03.07-1ubuntu1).
> 0 upgraded, 0 newly installed, 0 to remove and 25 not upgraded.
> noah at nuc2:~$ sudo mount /dev/mapper/pc--vg-root /media/USB
> mount: /media/USB: wrong fs type, bad option, bad superblock on 
> /dev/mapper/pc--vg-root, missing codepage or helper program, or other
> error.
> noah at nuc2:~$ ls -l /dev/mapper/pc--vg-root
> lrwxrwxrwx 1 root root 7 Jul 14 00:44 /dev/mapper/pc--vg-root ->
> ../dm-0

What does "lvdisplay" say?

Are you sure that your "root" logical volume in that "pc-vg" volume
group carries a valid file system?

Volker