[Bug 1833277] Re: LIvepatch widget should link to secure boot information on error

[Will Cooke]

We dont need to worry about 19.10 as Livepatches aren't produced for
non-LTS releases.

I think we need to do some research in to how to best detect if
Secureboot is enabled or not.  If we can do that without too much bother
we /could/ look at that setting, and at the error text produced by the
livepatch cli and tie the two together.  That feels a bit clunky though.
I'll ask whoever is going to work on this to comment here.

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Title:
  LIvepatch widget should link to secure boot information on error

Status in update-notifier package in Ubuntu:
  Triaged

Bug description:
  The livepatch widget will show an error[0] if patches cannot be
  applied. They cannot be applied on a Secure Boot system unless the
  livepatch signing key is imported. Unfortunately this requires a
  reboot and some confirmation in the UEFI settings, so it can't be
  automated.

  `canonical-livepatch help` displays some instructions to fix this:

  
  SECUREBOOT:
         If you are using secure boot, you will also need to import the livepatch public keys into your keyring.

         This can be done with the following command:
         sudo mokutil --import /snap/canonical-livepatch/current/keys/livepatch-kmod.x509

         After this enter a password if necessary for MOK, then reboot.
         Your BIOS will then guide you through enrolling a new key in MOK.
         At this point you will be able to verify the module signatures.

  This is probably something worth linking to from that error message.
  In general, we might need a page explaining other reasons the kernel
  can't be patched, how to get more details from the system log, etc.

  c at slate:~$ canonical-livepatch status
  client-version: 9.3.0
  architecture: x86_64
  cpu-model: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
  last-check: 2019-06-18T10:40:35-05:00
  boot-time: 2019-06-18T11:05:06-05:00
  uptime: 50m59s
  status:
  - kernel: 4.15.0-51.55-generic
    running: true
    livepatch:
      checkState: check-failed
      patchState: apply-failed
      version: "52.3"
      fixes: |-
        * CVE-2019-11477
        * CVE-2019-11478

  [0] https://drive.google.com/file/d/1cQbtCNE-
  ekoPO159SJDwKrjPGpkSuucm/view?usp=sharing

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