This bug was fixed in the package initramfs-tools - 0.120ubuntu1
---
initramfs-tools (0.120ubuntu1) wily; urgency=medium
* Merge from debian, remaining changes (up to 0.103ubuntu15):
- Drop hooks/keymap and associated code; console-setup takes care of this
in Ubuntu.
** Branch linked: lp:debian/initramfs-tools
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https://bugs.launchpad.net/bugs/889584
Title:
bad version number in trigger
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This is a side-effect of using dpkg --compare-versions to compare kernel
versions, and dpkg prints the (harmless, but I admit, a bit scary)
warning because it's generally used to compare package versions (where
underscore is an illegal character in .deb versions).
I've committed a fix upstream[1]