I am also facing the same problem, dmesg from last boot is just like Pavel's:
[ 0.626201] Write protecting the kernel read-only data: 12288k [ 0.627546] Freeing unused kernel memory: 1040K (ffff88000e6fc000 - ffff88000e800000) [ 0.628512] Freeing unused kernel memory: 836K (ffff88000eb2f000 - ffff88000ec00000) [ 0.634382] systemd-udevd[114]: starting version 204 [ 0.643713] mii: module verification failed: signature and/or required key missing - tainting kernel [ 0.644296] ahci 0000:00:1f.2: version 3.0 [ 0.644381] ahci 0000:00:1f.2: irq 42 for MSI/MSI-X [ 0.644778] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded [ 0.644783] r8169 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control [ 0.644981] r8169 0000:03:00.0: irq 43 for MSI/MSI-X -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1241251 Title: Some kernel modules are failing digital signature checks during boot - kernel is tainted. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241251/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
