[Bug 2041827] Re: update-grub sorts custom kernel below older/lower package kernels

[Ravi Kant Sharma]

** Changed in: grub2 (Ubuntu Noble)
     Assignee: Julian Andres Klode (juliank) => Mate Kukri (mkukri)

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Title:
  update-grub sorts custom kernel below older/lower package kernels

Status in grub2 package in Ubuntu:
  Triaged
Status in grub2 source package in Mantic:
  New
Status in grub2 source package in Noble:
  Triaged

Bug description:
  Since the upgrade to 23.10 my custom built kernels do not sort on top
  of grub menu anymore, even though their number is higher than the
  packaged kernels:

  See the output of grub-sort-version -r for the default kernel list on
  my system, as constructed by /etc/grub.d/10_linux

  # for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do echo $i; list="$list $i"; done
  /boot/vmlinuz-6.5.0-10-generic
  /boot/vmlinuz-6.5.0-9-generic
  /boot/vmlinuz-6.5.8
  /boot/vmlinuz-6.5.9
  /boot/vmlinuz-6.6.0
  /vmlinuz-*
  /boot/kernel-*

  # echo $list | tr ' ' '\n' | sed -e 's/\.old$/ 1/; / 1$/! s/$/ 2/' | /usr/lib/grub/grub-sort-version -r | sed -e 's/ 1$/.old/; s/ 2$//'
  /vmlinuz-*
  /boot/vmlinuz-6.5.0-10-generic
  /boot/vmlinuz-6.5.0-9-generic
  /boot/vmlinuz-6.6.0              <!--- Used to be on top before 23.10
  /boot/vmlinuz-6.5.9
  /boot/vmlinuz-6.5.8
  /boot/kernel-*

  As can be seen from the output, /boot/vmlinuz-6.5.0-10-generic sorts
  above /boot/vmlinuz-6.6.0 which is a regression compared to 23.04

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