Weekly software update failed

[Mike Van Pelt]

Just clicked the "Software Updater" to do the weekly updates, and it failed. "Not all updates can be installed", with list of possible reasons. I clicked the "Partial upgrade" button, and it said "It was impossible to install a required package. Pleast report this as a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

Which is what got me here...

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.23
ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
Uname: Linux 4.4.0-112-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CrashDB: ubuntu
Date: Thu Feb 15 17:05:44 2018
InstallationDate: Installed on 2016-04-28 (658 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog: