Same issue $ lsb_release -r Release: 14.04 $ uname -r 3.13.0-52-generic
May 10 00:40:40 kernel: [...] Request for unknown module key 'Magrathea: Glacier signing key: 1981bc916ffc00599231ec5630e666e0256fd6f1' err -11 May 10 00:40:40 kernel: [...] ipt_REJECT: module verification failed: signature and/or required key missing - tainting kernel -- 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