[Bug 1942039] [NEW] Ubuntu server 20.04 disk size is incorrect by the command fdisk

[shangsong]

Public bug reported:

1.Fresh install Ubuntu server 20.04.2 on lenovo server with 1.2TiB disk.
2.The installer display it 1.091TiB, but it display 1.9TiB by the command "fdisk -l".
3.Finsh the installation and boot into OS, it still display 1.9TiB as following:
# cat ./sos_commands/block/fdisk_-l_.dev.sdb
Disk /dev/sdb: 1.9 TiB, 1200243695616 bytes, 2344225968 sectors
Disk model: ST1200MM0088    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

The other things:
1.The ubuntu server 21.04 is normal at the same environment.
2.The latest ubuntu server 20.04 daily build can reproduce the issue.

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "sosreport and installer screenshot"
   https://bugs.launchpad.net/bugs/1942039/+attachment/5521562/+files/log_screenshot.zip

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https://bugs.launchpad.net/bugs/1942039

Title:
  Ubuntu server 20.04 disk size is incorrect by the command fdisk

Status in util-linux package in Ubuntu:
  New

Bug description:
  1.Fresh install Ubuntu server 20.04.2 on lenovo server with 1.2TiB disk.
  2.The installer display it 1.091TiB, but it display 1.9TiB by the command "fdisk -l".
  3.Finsh the installation and boot into OS, it still display 1.9TiB as following:
  # cat ./sos_commands/block/fdisk_-l_.dev.sdb
  Disk /dev/sdb: 1.9 TiB, 1200243695616 bytes, 2344225968 sectors
  Disk model: ST1200MM0088    
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes

  The other things:
  1.The ubuntu server 21.04 is normal at the same environment.
  2.The latest ubuntu server 20.04 daily build can reproduce the issue.

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