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

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