Public bug reported:

I'm installing Ubuntu 18.04.2 amd64 server on a BIOS booted VirtualBox
VM. It has two storages, on which I previously installed Ubuntu using
the same installer. Then, I created an MD RAID-1 backed by a total of
two component devices, which are partitions, one on each of the two
storages. On top of this RAID array, I had the installer create an LV PV
and VG.

I am now re-installing using the same disks. Subiquity's manual
partitoning screen starts with a display of two blank HDDs - it states
that there is nothing on them, no partitions, no other block devices.

I start partitioning this:

HDD1 (10GB)
PT1: 1MB, bios_grub
PT2: 1GB, ext4, /boot
PT3: 8.997GB, comp. of md0

HDD2 (10GB)
PT1: 1MB, unused
PT2: 1GB, unused
PT3: 8.997GB, comp. of md0

MD
MD0: 8.989GB, RAID-1

Then I try to make md0 a PV for a VG named "vg0" (pre-filled default
name). At this point, the installer reports: "vg0 is not a valid name
for a volume group" (screenshot attached).

Which is nonsense unless you know that a vg0 already exists on these
drives - but the installer doesn't tell you, rather claims there was
nothing there.

Naming the VG "vg1" instead succeeds and the installation continues.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1817422

Title:
  "vg0 is not a valid name for a volume group" if VG already exists

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