[Bug 1786491] Re: grub2 verify signed kernel exists or abort upgrade

[Julian Andres Klode]

** Description changed:

  [Impact]
  grub2 should fail to install if no signed kernels exist
  
  [Test case]
- TODO
+ On a secure boot system:
+ * Install grub-efi-amd64{,signed} and signed kernel => installs
+ * Install grub-efi-amd64{,signed} and only unsigned kernel => prevents
+ On a non-secure-boot system:
+ * Install grub-efi-amd64{,signed} and only unsigned kernel => installs
  
  [Regression potential]
  Upgrades can break.

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https://bugs.launchpad.net/bugs/1786491

Title:
  grub2 verify signed kernel exists or abort upgrade

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  In Progress
Status in grub2-signed source package in Bionic:
  In Progress
Status in grub2 source package in Cosmic:
  Fix Released
Status in grub2-signed source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  grub2 should fail to install if no signed kernels exist

  [Test case]
  On a secure boot system:
  * Install grub-efi-amd64{,signed} and signed kernel => installs
  * Install grub-efi-amd64{,signed} and only unsigned kernel => prevents
  On a non-secure-boot system:
  * Install grub-efi-amd64{,signed} and only unsigned kernel => installs

  [Regression potential]
  Upgrades can break.

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