[Bug 1900078] [NEW] Executing "grub-install /dev/sda" failed

[handsome_feng]

Public bug reported:

Testing the 20201013 ubuntu and ubuntukylin iso,
installation came up with the following error:

```
Executing "grub-install /dev/sda" failed
This is a fatal error
```

Machine: Dell optiplex 380
Mode: mbr/BIOS
Install: manual partitioning, with or without ESP, have the same result

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

** Attachment added: "grub-installing -error.jpg"
   https://bugs.launchpad.net/bugs/1900078/+attachment/5422783/+files/grub-installing%20-error.jpg

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https://bugs.launchpad.net/bugs/1900078

Title:
  Executing "grub-install /dev/sda" failed

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Testing the 20201013 ubuntu and ubuntukylin iso,
  installation came up with the following error:

  ```
  Executing "grub-install /dev/sda" failed
  This is a fatal error
  ```

  Machine: Dell optiplex 380
  Mode: mbr/BIOS
  Install: manual partitioning, with or without ESP, have the same result

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