Solved by installing the kernel from http://kernel.ubuntu.com/~kernel- ppa/mainline/daily/2015-02-10-vivid/ leading to "3.19.0-999-generic #201502092105"
According to https://bugzilla.kernel.org/show_bug.cgi?id=92981 the kernel on http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-vivid/ was built incorrectly ** Bug watch added: Linux Kernel Bug Tracker #92981 http://bugzilla.kernel.org/show_bug.cgi?id=92981 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1253155 Title: Failure to validate module signature at boot time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1253155/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
