Public bug reported:

extlinux-update contains the line _VERSIONS="$(cd /boot && ls vmlinuz-*
| grep -v .dpkg-tmp | sed -e 's|vmlinuz-||g' | sort -nr)", which
attempts to sort on version numbers numerically.  The problem is that in
kernel version numbers, 3.10 comes after 3.9, while sort -n will sort it
before (as 3.10 is numerically lower than 3.90 or 3.9).

Debian has already fixed it to use the version sort (sort -Vr).

I think this is worth an SRU as it causes 3.10+ kernels to not be booted
while any 3.2-3.9 kernels are installed.

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

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https://bugs.launchpad.net/bugs/1383318

Title:
  extlinux-update sorts kernels in the wrong order due to not using sort
  -Vr, fixed upstream

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