** 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 OS, update/dist-upgrade, and reinstalling various
  software, 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
  
+ There are various references to occurrences of the error apparent at
+ boot time concerning NVIDIA drivers.  I have onboard Intel graphics.
+ 
  And (for future reference) is there a way to rescue an apparently
  bricked machine?

** 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 OS, update/dist-upgrade, and reinstalling various
  software, 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
  
  There are various references to occurrences of the error apparent at
  boot time concerning NVIDIA drivers.  I have onboard Intel graphics.
  
- And (for future reference) is there a way to rescue an apparently
- bricked machine?
+ And (for future reference) is there a way to rescue a machine apparently
+ bricked in this way?

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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)

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