Public bug reported: This bug affects the physical host machine, but seems to stem from virtualbox.
After apt-get dist-upgrade upgraded kernel from 4.15.0-20 to to 4.15.0-62, the machine fails to boot after restart. The text: PKCS#7 signature not signed with a trusted key is repeated on 4 lines. Different shades of "black" as background to text appear at approx 1s intervals, then whole screen goes blank, this loops for at least 2 mins. No alternative terminals (Alt+Fx) are available. After reinstalling and update/dist-upgrade, dmesg contains the following: $ sudo dmesg | grep signature [sudo] password for user: [ 1614.972768] PKCS#7 signature not signed with a trusted key [ 1614.973013] vboxdrv: module verification failed: signature and/or required key missing - tainting kernel [ 1615.015852] PKCS#7 signature not signed with a trusted key [ 1615.024261] PKCS#7 signature not signed with a trusted key [ 1615.032860] PKCS#7 signature not signed with a trusted key ** Affects: virtualbox (Ubuntu) Importance: Undecided Status: New ** Summary changed: - Ubuntu Mate 18.04 boot fails after upgrade from 4.15.0-20 to to 4.15.0-62 + Boot fails after upgrade from 4.15.0-20 to to 4.15.0-62 (Ubuntu Mate 18.04.3) ** Summary changed: - Boot fails after upgrade from 4.15.0-20 to to 4.15.0-62 (Ubuntu Mate 18.04.3) + Boot fails after kernel upgrade from 4.15.0-20 to to 4.15.0-62 (Ubuntu Mate 18.04.3) ** Description changed: + This bug affects the physical host machine, but seems to stem from + virtualbox. + After apt-get dist-upgrade upgraded kernel from 4.15.0-20 to to 4.15.0-62, the machine fails to boot after restart. The text: PKCS#7 signature not signed with a trusted key is repeated on 4 lines. Different shades of "black" as background to text appear at approx 1s intervals, then whole screen goes blank, this loops for at least 2 mins. No alternative terminals (Alt+Fx) are available. After reinstalling and update/dist-upgrade, dmesg contains the following: $ sudo dmesg | grep signature - [sudo] password for user: + [sudo] password for user: [ 1614.972768] PKCS#7 signature not signed with a trusted key [ 1614.973013] vboxdrv: module verification failed: signature and/or required key missing - tainting kernel [ 1615.015852] PKCS#7 signature not signed with a trusted key [ 1615.024261] PKCS#7 signature not signed with a trusted key [ 1615.032860] PKCS#7 signature not signed with a trusted key -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1843662 Title: Boot fails after kernel upgrade from 4.15.0-20 to to 4.15.0-62 (Ubuntu Mate 18.04.3) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1843662/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs