No volume groups found

user@ubuntu:~$ # pvscan
user@ubuntu:~$ sudo pvscan
  PV /dev/sdb1                      lvm2 [100.00 GiB]
  Total: 1 [100.00 GiB] / in use: 0 [0   ] / in no VG: 1 [100.00 GiB]
user@ubuntu:~$
user@ubuntu:~$ # pvdisplay
user@ubuntu:~$ sudo pvdisplay -m
  "/dev/sdb1" is a new physical volume of "100.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name
  PV Size               100.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               I8V6wc-5RYl-mj5i-0vek-Zu66-V8TA-FON0L2


user@ubuntu:~$
user@ubuntu:~$ # vgchange
user@ubuntu:~$ sudo vgchange -a y # activate
  No volume groups found
user@ubuntu:~$
user@ubuntu:~$ # lvdisplay
user@ubuntu:~$ sudo lvdisplay
  No volume groups found
user@ubuntu:~$