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] for this, and it should find its way into the latest Ubuntu devel release soon enough. [1] http://anonscm.debian.org/gitweb/?p=kernel/initramfs- tools.git;a=commitdiff;h=ca324ad442745f437537eb7417c811c6f0ae2307 ** Changed in: initramfs-tools (Ubuntu) Status: New => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/889584 Title: bad version number in trigger To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/889584/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
