[Bug 1891131] [NEW] Invalid config generated when using GRUB_EARLY_INITRD_LINUX_CUSTOM

[Jrandiny]

Public bug reported:

When trying to add GRUB_EARLY_INITRD_LINUX_CUSTOM options in
/etc/default/grub the resulting grub.cfg become invalid

For example by adding

GRUB_EARLY_INITRD_LINUX_CUSTOM="acpi_override"

Result:
```
	initrd	/boot/ acpi_override initrd.img-5.8.0-050800-generic
```

Expected: 
```
	initrd	/boot/acpi_override /boot/initrd.img-5.8.0-050800-generic

```

When comparing 10_linux script with other distro (Manjaro) it seems that
the Ubuntu version doesn't account for multiple initrd

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: grub-common 2.04-1ubuntu26.2
Uname: Linux 5.8.0-050800-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Aug 11 13:18:18 2020
InstallationDate: Installed on 2020-08-09 (1 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Patch added: "Possible fix"
   https://bugs.launchpad.net/bugs/1891131/+attachment/5400583/+files/10_linux.patch

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https://bugs.launchpad.net/bugs/1891131

Title:
  Invalid config generated when using GRUB_EARLY_INITRD_LINUX_CUSTOM

Status in grub2 package in Ubuntu:
  New

Bug description:
  When trying to add GRUB_EARLY_INITRD_LINUX_CUSTOM options in
  /etc/default/grub the resulting grub.cfg become invalid

  For example by adding

  GRUB_EARLY_INITRD_LINUX_CUSTOM="acpi_override"

  Result:
  ```
  	initrd	/boot/ acpi_override initrd.img-5.8.0-050800-generic
  ```

  Expected: 
  ```
  	initrd	/boot/acpi_override /boot/initrd.img-5.8.0-050800-generic

  ```

  When comparing 10_linux script with other distro (Manjaro) it seems
  that the Ubuntu version doesn't account for multiple initrd

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub-common 2.04-1ubuntu26.2
  Uname: Linux 5.8.0-050800-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Aug 11 13:18:18 2020
  InstallationDate: Installed on 2020-08-09 (1 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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