Disable kernel signature checks during boot on Ubuntu?

[Jeffrey Walton]

On Mon, Sep 2, 2019 at 5:00 PM Jeffrey Walton <noloader at gmail.com> wrote:
>
> Ubuntu provided 5.0.0-27-generic today. I attempted to reboot but
> booting fails due to a failed signature check.
>
> I'd like to tell the kernel to skip the signature check during boot. I
> found Ubuntu's UEFI | SecureBoot | DKMS
> (https://wiki.ubuntu.com/UEFI/SecureBoot/DKMS) wiki page. It discusses
> several ways to disable signature checks but they assume a working
> machine.
>
> I'm at the grub boot menu with the menu open ready for editing.
>
> What option should I use to disable the signature checks during boot?

Attached is the transcript of the update. I keep a copy in case of
errors (like now).

This looks unusual. The latest kernel was handled like it was the old kernel:

The following packages will be REMOVED:
  linux-image-5.0.0-27-generic*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 222607 files and directories currently installed.)
Purging configuration files for linux-image-5.0.0-27-generic
(5.0.0-27.28~18.04.1) ...
I: /vmlinuz is now a symlink to boot/vmlinuz-5.0.0-25-generic
I: /initrd.img is now a symlink to boot/initrd.img-5.0.0-25-generic
rmdir: failed to remove '/lib/modules/5.0.0-27-generic': Directory not empty
Removed kernel linux-image-5.0.0-27-generic
...
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