[Bug 1926600] [NEW] Ubuntu server 20.04.2 installer hidden partition problem

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The Ubuntu server 20.04.2 installer (ubiquity?) doesn't show all of the
partitions that will be created on the storage configuration page for
the first disk, specifically the GRUB BIOS boot partition.

To reproduce:

Boot Ubuntu Server 20.04.2 iso on a BIOS based x86-64 machine or VM
Choose custom storage layout
Format the first disk if necessary to remove existing partitions
Select the first disk -> Add GPT partition -> Create a 1 MB unformatted partition

Now, under the 'Available devices' section of the storage configuration
screen only 1 partition is listed on the first disk but it is labelled
as partition 2. This seems to be because the installer will create
another 1 MB GRUB BIOS boot partition before the first partition that
the user creates on the first disk but this partition doesn't get shown
in the installer.

The installer doesn't do this for additional disks, only the first
usable disk. Custom storage layout shouldn't be creating partitions that
are hidden or uneditable by the user.

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


** Tags: bot-comment
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Ubuntu server 20.04.2 installer hidden partition problem
https://bugs.launchpad.net/bugs/1926600
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