Add unique VG name to avoid activating multiple VGs with the same name from multiple disk drives

[David Hedlund]

The default volume group (VG) name in both Ubuntu, and Ubuntu Server is: ubuntu-vg

###########################
Boot issue
* You cannot boot an Ubuntu (or Ubuntu Server) disk drive, if you have another disk drive attached with Ubuntu (or Ubuntu Server) installed.

###########################
Disk mount issue in other distros

* In other distros that are usign other VG names: If you attach other disk drives that have identical VG names, they will not be mounted. And only one disk drive will be mounted if you are trying to mount them:

$ sudo apt-get install lvm2
$ reboot

Then:
$ sudo modprobe dm-mod
$ sudo vgchange -a y
  WARNING: VG name ubuntu-vg is used by VGs HW3PiJ-YN4Z-YlBb-IQin-CE00-1xnq-YKwsbc and 2afQMx-nuzj-xw8I-dEkY-n969-jM5v-zn1MSg.
  Fix duplicate VG names with vgrename uuid, a device filter, or system IDs.
  WARNING: activating multiple VGs with the same name is dangerous and may fail.
  1 logical volume(s) in volume group "ubuntu-vg" now active
  WARNING: activating multiple VGs with the same name is dangerous and may fail.
  device-mapper: create ioctl on ubuntu--vg-ubuntu--lv LVM-2afQMxnuzjxw8IdEkYn969jM5vzn1MSgnfgWV7d1tEfHHYXR33JuS7XxqMRcPgiB failed: Device or resource busy
  0 logical volume(s) in volume group "ubuntu-vg" now active

#########################
Solution

* Universally Unique Identifiers, or UUIDS, are 128 bit numbers.
* Logical volume names must be unique system wide and can range from 1 to 15 characters

Proposed solution: Extend "ubuntu-vg" to "ubuntu-vg-<four first characters of its UUID>

[Dan Bungert (dbungert)]

Hi there, thanks for the report.

This looks like a regular bug, not security, so I'm moving this back to a Public information type bug.