mount unknown filesystem type 'lvm2_member'

After upgrading from 14.04 to 16.06 my system failed.

I have done a fresh install on a new drive, but that failed too...

I have done another install but now when trying to mount my original drive with all my files on I get this message:

pst007x@Home-Server:~$ sudo mount /dev/sdb5 /media/newhd
[sudo] password for pst007x: 
mount: unknown filesystem type 'LVM2_member'
pst007x@Home-Server:~$

I have installed 'lvm2' from the repos and gparted sees the drive, however Nautilus does not see the drive and therefore not mounted.

Any advise?

EDIT:

I tried this:

pst007x@Home-Server:~$ sudo apt-get install lvm2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
lvm2 is already the newest version (2.02.133-1ubuntu10).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
pst007x@Home-Server:~$ sudo vgs
  VG        #PV #LV #SN Attr   VSize   VFree 
  ubuntu-vg   1   2   0 wz--n- 465.28g     0 
  ubuntu-vg   1   2   0 wz--n- 465.52g 52.00m
pst007x@Home-Server:~$ sudo vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "ubuntu-vg" using metadata type lvm2
  Found volume group "ubuntu-vg" using metadata type lvm2
pst007x@Home-Server:~$ sudo lvs
  LV     VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   ubuntu-vg -wi-ao---- 461.28g                                                    
  root   ubuntu-vg -wi------- 461.47g                                                    
  swap_1 ubuntu-vg -wi-------   4.00g                                                    
  swap_1 ubuntu-vg -wi-ao----   4.00g                                                    
pst007x@Home-Server:~$ sudo modprobe dm-mod
pst007x@Home-Server:~$ sudo vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "ubuntu-vg" using metadata type lvm2
  Found volume group "ubuntu-vg" using metadata type lvm2
pst007x@Home-Server:~$ sudo vgchange -ay ubuntu-vg
  device-mapper: create ioctl on ubuntu--vg-rootLVM-xhGIrhlZUAJeJA3fWJOOSvuTUO3vZOH9tqZgBj8dGOLHoYzCStcE02NcX8UGpglD failed: Device or resource busy
  1 logical volume(s) in volume group "ubuntu-vg" now active
pst007x@Home-Server:~$ ls /mnt/
fcroot
pst007x@Home-Server:~$ ls /dev/mapper
control  ubuntu--vg-root  ubuntu--vg-swap_1
pst007x@Home-Server:~$ sudo vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "ubuntu-vg" using metadata type lvm2
  Found volume group "ubuntu-vg" using metadata type lvm2
pst007x@Home-Server:~$ sudo lvscan
  ACTIVE            '/dev/ubuntu-vg/root' [461.28 GiB] inherit
  inactive          '/dev/ubuntu-vg/swap_1' [4.00 GiB] inherit
  inactive          '/dev/ubuntu-vg/root' [461.47 GiB] inherit
  ACTIVE            '/dev/ubuntu-vg/swap_1' [4.00 GiB] inherit
pst007x@Home-Server:~$

Not to detract from the accepted answer, but wanted to offer a more complete solution that hasn't failed me yet.

udisksctl unlock -b /dev/sdb5
sudo mkdir /mnt/data
sudo mount /dev/dm-1 /mnt/data

run into mount: unknown filesystem type 'LVM2_member' do the commands below

sudo bash
vgdisplay
vgrename <VG UUID> new_name
modprobe dm-mod
vgchange -ay
lvscan
mount /dev/new_name/root /mnt/data/

You used the exact same name (ubuntu-vg) for your new volume group as the old volume group. You must give them unique names. You can rename one of the groups using vgrename and its UUID.

Find the UUID with vgdisplay and then rename the volume group:

vgrename <VG UUID> new_name

mount unknown filesystem type 'lvm2_member'

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