Comment 9 for bug 1042511

Verified fixed in both trusty-proposed and utopic-proposed. For each release I verified that I could see the failure, then verified that an upgrade to syslinux-themes-debian in -proposed would fix the issue, and then verified that a fresh install of syslinux-themes-debian from -proposed also fixes the issue.

I discovered that the bug is a little harder to trigger on Utopic because extlinux doesn't supply /etc/default/extlinux any more, so it generally also isn't present if extlinux is removed after upgrade to Utopic. However, although unlikely I think a user could still end up with a file there (eg. if extlinux was removed while the system was still on Trusty and never purged since), so I worked around this in testing with:

echo "EXTLINUX_THEME=debian"|sudo tee --append /etc/default/extlinux

This reproduced the problem on Utopic and so I was able to verify that the package in utopic-proposed does fix the issue.