loaded 18.04 clean disc then 20.04 could not load 22.04

[Malcolm White]

Started to load 22.04 then said 20.04 minimal was not present.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.39
ProcVersionSignature: Ubuntu 5.4.0-126.142-generic 5.4.203
Uname: Linux 5.4.0-126-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Thu Oct 6 15:48:06 2022
InstallationDate: Installed on 2022-10-05 (0 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2022-10-06 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2022-10-06 15:44:28.240275
 Log time: 2022-10-06 15:44:37.058612
 Log time: 2022-10-06 15:47:20.736638
 Log time: 2022-10-06 15:48:11.394411
VarLogDistupgradeTermlog: