[Bug 1247700] Re: default kernel order issue with RC and final versions

[Christopher Chavez]

At first, it looks like this is simply because
"/boot/vmlinuz-3.12.0-031200rc7-generic" is lexicographically greater
than "/boot/vmlinuz-3.12.0-031200-generic", but I haven't actually
looked at the source for grub2, and something in /etc/grub.d/10_linux
may also be responsible for sorting the entries.

I haven't come across documentation saying whether or not this is
expected behavior, but in bug 476540 it was mentioned how the entry
sorting was changed to the algorithm used by dpkg. The discussion in
http://savannah.gnu.org/bugs/?42597 would indicate this is issue is due
to the intended behavior of /etc/grub.d/10_linux, at least upstream.
There are several other similar discussions grub2's kernel menu sorting
and /etc/grub.d/10_linux.

There was a similar issue reported with update-initramfs that was
resolved by using the linux-version command (from linux-base): cf.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770394 . This might be
something to incorporate into /etc/grub.d/10_linux as a solution to this
and similar issues.

I happened to be testing mainline kernels at the moment, and as a
workaround I use grub-customizer to specify which kernel to boot.

** Bug watch added: GNU Savannah Bug Tracker #42597
   http://savannah.gnu.org/bugs/?42597

** Bug watch added: Debian Bug tracker #770394
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770394

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https://bugs.launchpad.net/bugs/1247700

Title:
  default kernel order issue with RC and final versions

Status in grub2 package in Ubuntu:
  New

Bug description:
  So i have these kernels installed:
  Found linux image: /boot/vmlinuz-3.12.0-031200rc7-generic
  Found initrd image: /boot/initrd.img-3.12.0-031200rc7-generic
  Found linux image: /boot/vmlinuz-3.12.0-031200-generic
  Found initrd image: /boot/initrd.img-3.12.0-031200-generic
  Found linux image: /boot/vmlinuz-3.11.0-12-generic
  Found initrd image: /boot/initrd.img-3.11.0-12-generic

  When grub.cfg is generated 3.12.0-031200 should be the default kernel but instead 3.12.0-031200rc7 is default
  the default should the 3.12 final instead or 3.12 rc7

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: grub2-common 2.00-19ubuntu2.1
  Uname: Linux 3.12.0-031200rc7-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Date: Sun Nov  3 20:17:46 2013
  InstallationDate: Installed on 2013-05-01 (186 days ago)
  InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  MarkForUpload: True
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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