system locked up with system upgrade UI

[pleabargain]

I opened my machine to find that the system updater waiting but screen was unresponsive.
Mouse moved but on click was unresponsive
I went to
ctrl alt f3
htop
to see if there was a CPU overload but nothing there.
I shut down chrome but screen was still unresponsive

Finally after much clicking system upgrader responded
at one point I had two windows asking if I wanted to upgrade.

I noticed that dh-python is not available in the ubuntu repositories.

I eventually shut all system update windows but UI was still sluggish
I ctrl alt f3 and then reboot to be able to post this error.

I took videos of the behavior. see below

https://www.youtube.com/watch?v=DEkEkl3otok
https://www.youtube.com/watch?v=r1OZKETeTQM

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubuntu-release-upgrader-core 1:20.10.16
ProcVersionSignature: Ubuntu 5.8.0-55.62-generic 5.8.18
Uname: Linux 5.8.0-55-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.7
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 17 07:58:31 2021
InstallationDate: Installed on 2015-08-23 (2124 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog:

modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2021-01-13T09:36:03.851337