[Bug 1870626] [NEW] Grub boot menu shows only one lowlatency kernel entry

[Lassi]

Public bug reported:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=19.10
DISTRIB_CODENAME=eoan
DISTRIB_DESCRIPTION="Ubuntu 19.10"

ubuntustudio-default-settings:
  Installed: 0.73
  Candidate: 0.73
  Version table:


Expected:
After running 'sudo update-grub', all installed lowlatency kernel entries are shown in the boot menu.

Actual:
Only the latest lowlatency kernel entry is shown.


The issue seems to be due to 09_lowlatency helper script. It only adds the latest installed lowlatency kernel to the list. Enabling 10_linux helper instead, all kernels under /boot/ were listed (-generic kernels also).

For example, I have the following kernels installed:
vmlinuz-5.0.0-20-lowlatency
vmlinuz-5.3.0-45-lowlatency

And with the default configuration, only 5.3.0-45-lowlatency is listed
during boot in Grub menu.

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

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https://bugs.launchpad.net/bugs/1870626

Title:
  Grub boot menu shows only one lowlatency kernel entry

Status in grub2 package in Ubuntu:
  New

Bug description:
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=19.10
  DISTRIB_CODENAME=eoan
  DISTRIB_DESCRIPTION="Ubuntu 19.10"

  ubuntustudio-default-settings:
    Installed: 0.73
    Candidate: 0.73
    Version table:

  
  Expected:
  After running 'sudo update-grub', all installed lowlatency kernel entries are shown in the boot menu.

  Actual:
  Only the latest lowlatency kernel entry is shown.

  
  The issue seems to be due to 09_lowlatency helper script. It only adds the latest installed lowlatency kernel to the list. Enabling 10_linux helper instead, all kernels under /boot/ were listed (-generic kernels also).

  For example, I have the following kernels installed:
  vmlinuz-5.0.0-20-lowlatency
  vmlinuz-5.3.0-45-lowlatency

  And with the default configuration, only 5.3.0-45-lowlatency is listed
  during boot in Grub menu.

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