sudo dpkg --configure -a
Setting up grub-efi-amd64-signed (1.93.5+2.02-2ubuntu8.4) ...
Installing for x86_64-efi platform.
Could not prepare Boot variable: No space left on device
grub-install: error: efibootmgr failed to register the boot entry: Input/output error.
dpkg: error processing package grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of shim-signed:
shim-signed depends on grub-efi-amd64-signed; however:
Package grub-efi-amd64-signed is not configured yet.
dpkg: error processing package shim-signed (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
grub-efi-amd64-signed
shim-signed
But /boot has space.
df -h | grep boot
/dev/sda1 511M 4.7M 507M 1% /boot/efi
Some more information when trying to fix this.
sudo dpkg --configure -a amd64-signed (1.93.5+ 2.02-2ubuntu8. 4) ... amd64-signed (--configure): amd64-signed package post-installation script subprocess returned error exit status 1 amd64-signed; however: amd64-signed is not configured yet.
Setting up grub-efi-
Installing for x86_64-efi platform.
Could not prepare Boot variable: No space left on device
grub-install: error: efibootmgr failed to register the boot entry: Input/output error.
dpkg: error processing package grub-efi-
installed grub-efi-
dpkg: dependency problems prevent configuration of shim-signed:
shim-signed depends on grub-efi-
Package grub-efi-
dpkg: error processing package shim-signed (--configure): amd64-signed
dependency problems - leaving unconfigured
Errors were encountered while processing:
grub-efi-
shim-signed
But /boot has space.
df -h | grep boot
/dev/sda1 511M 4.7M 507M 1% /boot/efi
Looking at similar problems (https:/ /bugs.launchpad .net/ubuntu/ +source/ shim-signed/ +bug/1776271) could need a BIOS update. Currently
sudo lshw | less
description: BIOS
*-core
description: Motherboard
product: 2B47
vendor: HP
physical id: 0
version: 1.04
*-firmware
vendor: AMI
physical id: 0
version: A0.13
date: 12/21/2015
size: 64KiB
capacity: 8128KiB
Have not yet rebooted after the upgrade, but in case reboot fails, I will report back on a different computer.