[Bug 2023957] [NEW] Ubiquity: Manual partitioning: Add "physical volume for LVM", and make it possible to encrypt it

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

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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.

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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

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Solution

For "Manual partitioning":
* Like in "Erase disk and install Ubuntu" option: 1) Add "physical volume for LVM" 2) Make it possible to encrypt it
* Add a default VG name, but make it possible to change it to avoid the issues described in the top of this issue.

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

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Ubiquity: Manual partitioning: Add "physical volume for LVM", and make it possible to encrypt it
https://bugs.launchpad.net/bugs/2023957
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