Solving the error “mount: unknown filesystem type LVM2_member”

I once executed a command to mount a disk:

sudo mount /dev/sda3 /media/test

And noticed the following error:

mount: unknown filesystem type ‘LVM2_member’

The disk was partitioned under LVM, so to mount it you need to specify not /dev/sda3, but let’s see the correct name with the command:

sudo lvdisplay

In my case, it was /dev/ubuntu-vg/root, and mount it:

sudo mount /dev/ubuntu-vg/root /media/test

Done.