Thanks for reporting this issue. The error in your logs is:
> Setting up shim-signed (1.27~16.10.1+0.9+1474479173.6c180c6-1ubuntu1) ... > Installing for x86_64-efi platform. > Installation finished. No error reported. > Running in non-interactive mode, doing nothing. > dpkg: error processing package shim-signed (--configure): > subprocess installed post-installation script returned error exit status 1 This indicates that the shim package detected dkms modules present on your system, and that you have SecureBoot enabled, and therefore SecureBoot must be administratively disabled in order for you to continue booting. And the prompt failed to be displayed, so it was impossible to prompt you for this. However, this should already have been the policy in place prior to your upgrade, so I'm not sure why you were prompted again. Could you please send the output of the following commands: $ cat /proc/sys/kernel/moksbstate_disabled $ od -tx1 /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c $ od -tx1 /sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23 ** Changed in: shim-signed (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1680052 Title: package shim-signed 1.27~16.10.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1680052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs