Couldn't upgrade from 18.04.6 LTS to 22.04 LTS

[Roger Fang]

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This was likely caused by:
 * Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade again.

If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 4.15.0-201.212-generic 4.15.18
Uname: Linux 4.15.0-201-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.28
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 20 16:16:29 2023
InstallationDate: Installed on 2018-11-13 (1529 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2023-01-20 (0 days ago)
VarLogDistupgradeTermlog:

[Roger Fang (geeky-1)]

Added main.log and apt.log. Didn't see anything in these log files causing upgrade to fail.

[Nick Rosbrook (enr0n)]

Reviewing the files from your upgrade attempt, you have installed nodejs from the nodesource PPA. This version of nodejs is greater than the one in the official archive and is keeping some packages installed which then prevents the upgrade from being calculated. Please remove nodejs along with any other packages from that archive and disable the archive. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!