Please run 'apport-collect 1518018' from the affected system.
The most likely explanation of this behavior is that the -signed
packages (grub-efi-amd64-signed, shim-signed) have accidentally become
uninstalled from your system, possibly due to a wrong apt sources
configuration that pulled inconsistent packages from -proposed; this
would leave you with only the unsigned packages installed, which the
upgrade would then try to write as your bootloader despite being
incompatible with SecureBoot.
It may be a good idea for us to check the presence of signed bootloaders
+ secureboot on upgrade and warn/fail if we are trying to install an
unsigned bootloader; yours would not be the first report of boot
problems resulting from uninstalling the secureboot bootloader package.
** Package changed: linux (Ubuntu) => shim (Ubuntu)
** Changed in: shim (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1518018
Title:
Secure boot fails after upgrade to 15.10
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1518018/+subscriptions
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