I am unable to update my Ubuntu from 18.04 to 20.4

[Preeyam Sahu]

Since the Ubuntu 20.04 is out I decide to upgrade my OS. I have Ubuntu 18.04.4 and tried to update using my terminal. But it won't update giving the message:-
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'.

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 6 22:23:08 2020
InstallationDate: Installed on 2018-08-13 (723 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-06 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-06T22:08:50.361763

[Brian Murray (brian-murray)]

At least part of the issue is due to the nodejs packages you have installed from nodesource.com. Please remove those packages and try the upgrade again.

[Preeyam Sahu (lneo02)]

I removed node and some other useless third party apps and removed them from sources.list using ppa purge but I am still receiving the same error.Except the issue regarding some signatures being unrecognised didn't appear

[Brian Murray (brian-murray)]

Please add the files /var/log/dist-upgrade/apt.log and /var/log/dist-upgrade/main.log from your most recent upgrade attempt then.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]

[Fernando Isasi (fisasi)]

The same problem:

[Fernando Isasi (fisasi)]

The same problem:

[Brian Murray (brian-murray)]

This is now happening because the gnuradio-dev package is installed.

[Fernando Isasi (fisasi)]

Thank you very much. System is already updated. Everything went OK.
Best regards

   Fernando Isasi

El lunes, 12 de octubre de 2020 16:41:51 (CEST) usted escribió:
> *** This bug is a duplicate of bug 1898152 ***
> https://bugs.launchpad.net/bugs/1898152
>
> This is now happening because the gnuradio-dev package is installed.
>
> ** This bug has been marked a duplicate of bug 1898152
> upgrade fails to calculate if gnuradio-dev is installed