Solution to mount: unknown file system type LVM2_ error

You may encounter the mount: unknown file system type LVM2_ error during the mounting process on your Ubuntu server. You can follow the steps below to resolve the error.

Using the command below, we can see that sda5 is lvm.

root@ubuntu :~# fdisk -l /dev/sda

root@ubuntu :~# lvmdiskscan

Then we scan the logical volume.

root@ubuntu:~# lvscan
inactive '/dev/186-vg/root' [28.76 GiB] inherit
inactive '/dev/186-vg/swap_1' [1.00 GiB] inherit

Since it will not be activated when the system boots, we activate the lvm volume using the following command.

root@ubuntu:~# vgchange -ay
2 logical volume(s) in volume group "186-vg" now active

Finally, we perform the mounting process according to lvm mount. You can use the command below.

root@ubuntu:~# mount /dev/186-vg/root /mnt/recover

After following the steps, the process was completed successfully.