Updated to 18.04 system hangs on boot

[Stephen Woods]

Kernel vmlinuz-4.15.0-117-generic
Hangs, last messages on screen are:
2.253507 usb 3-1: New USB device found, idVendor=1d05, idProduct=5000
2.253553 usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
2.253598 usb 3-1: Product: Combo Free KVM
2.253637 usb 3-1: Manufacturer: No Brand
2.624473 xhci_hdc 000:05:00.0: xHCI Host Controller
2.624515 xhci_hdc 0000:05:00.0 new USB Bus registered, assigned buss number 9

Recovery is via Grub and selecting the old last as installed Kernel vmlinuz-4.4.0-179-generic

Please note that this has happened since I upgraded
1) Description: Ubuntu 18.04.5 LTS
2) Release: 18.04
3)I expected to kernel to complete booting.
4)What happened was, it hangs, for hours.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.4.0-179.209-generic 4.4.219
Uname: Linux 4.4.0-179-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Mon Sep 21 09:19:21 2020
InstallationDate: Installed on 2015-04-11 (1990 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeAptlog:
 Log time: 2020-06-19 11:26:08.756033
 Starting pkgProblemResolver with broken count: 0
 Starting 2 pkgProblemResolver with broken count: 0
 Done
VarLogDistupgradeTermlog:

[Stephen Woods (scwoods1947)]

This bug is now moot as I have upgraded to 20.04.1 and it boots perfectly.