[Bug 1817422] [NEW] "vg0 is not a valid name for a volume group" if VG already exists

[Tom Reynolds]

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

Status in subiquity package in Ubuntu:
  New

Bug description:
  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.

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