[Bug 1901478] [NEW] Unable to add a GPT partition with 400+GB free space

[TJ]

Public bug reported:

20.04.1 installer, Custom storage layout

On a device with 400+ GB free space and 4 existing GPT partitions the
option to add a GPT partition is disabled.

Apparently the logic cannot code with dis-contiguous partitions!
 

root at ubuntu-server:/# gdisk -l /dev/sda
GPT fdisk (gdisk) version 1.0.5

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 1953459632 sectors, 931.5 GiB
Model: LOGICAL VOLUME  
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 05564500-64D5-40BE-A6EE-39476C575604
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 1953459598
Partitions will be aligned on 2048-sector boundaries
Total free space is 843898221 sectors (402.4 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          206847   100.0 MiB   EF00  EFI system partition
   2          206848          468991   128.0 MiB   0C01  Microsoft reserved ...
   3          468992       133304319   63.3 GiB    0700  Basic data partition
   4       977199104      1953458175   465.5 GiB   0700  Basic data partition

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

** Attachment added: "Unable to add a GPT partition"
   https://bugs.launchpad.net/bugs/1901478/+attachment/5427149/+files/subiquity-20.04.1-GPT.png

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https://bugs.launchpad.net/bugs/1901478

Title:
  Unable to add a GPT partition with 400+GB free space

Status in subiquity package in Ubuntu:
  New

Bug description:
  20.04.1 installer, Custom storage layout

  On a device with 400+ GB free space and 4 existing GPT partitions the
  option to add a GPT partition is disabled.

  Apparently the logic cannot code with dis-contiguous partitions!
   

  root at ubuntu-server:/# gdisk -l /dev/sda
  GPT fdisk (gdisk) version 1.0.5

  Partition table scan:
    MBR: protective
    BSD: not present
    APM: not present
    GPT: present

  Found valid GPT with protective MBR; using GPT.
  Disk /dev/sda: 1953459632 sectors, 931.5 GiB
  Model: LOGICAL VOLUME  
  Sector size (logical/physical): 512/512 bytes
  Disk identifier (GUID): 05564500-64D5-40BE-A6EE-39476C575604
  Partition table holds up to 128 entries
  Main partition table begins at sector 2 and ends at sector 33
  First usable sector is 34, last usable sector is 1953459598
  Partitions will be aligned on 2048-sector boundaries
  Total free space is 843898221 sectors (402.4 GiB)

  Number  Start (sector)    End (sector)  Size       Code  Name
     1            2048          206847   100.0 MiB   EF00  EFI system partition
     2          206848          468991   128.0 MiB   0C01  Microsoft reserved ...
     3          468992       133304319   63.3 GiB    0700  Basic data partition
     4       977199104      1953458175   465.5 GiB   0700  Basic data partition

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