This bug is due to a newer release of the kernel in precide-updates than trusty-updates, but it will only occur if you have both the "precise" and "trusty" repositories enabled (which I have because I'm using libtiff4):
root@wildcat:/var/lib/dpkg/info# apt-cache policy linux-image-3.13.0-63-generic linux-image-3.13.0-63-generic: Installed: 3.13.0-63.103 Candidate: 3.13.0-63.104~precise1 Version table: 3.13.0-63.104~precise1 0 500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages *** 3.13.0-63.103 0 500 http://gb.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 100 /var/lib/dpkg/status -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1492707 Title: package linux-image-3.13.0-63-generic 3.13.0-63.103 failed to install/upgrade: trying to overwrite '/lib/modules/3.13.0-63-generic/kernel/mm/hwpoison-inject.ko', which is also in package linux-image-extra-3.13.0-63-generic 3.13.0-63.103 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1492707/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs