Public bug reported:

I am unable to install regular packages from Ubuntu repositories through
Plasma Discover front end, throwing the error "no network connection
available" It's also unable to search and install updates throwing the
error "cannot refresh cache whilst offline" at startup.

However, snaps install just fine, and I can also install packages
through apt or Synaptic package manager.

From what I gather after a google search, it's a conflict between packagekit 
and networkmanager on Ubuntu.  Some relevant bug reports I found
https://bugs.kde.org/show_bug.cgi?id=412834
https://github.com/blue-systems/plasma-issues/issues/225
https://github.com/PackageKit/PackageKit/issues/336

Ubuntu release:
Description:    Ubuntu Impish Indri (development branch)
Release:        21.10

Package name:
plasma-discover:
  Instalado: 5.22.5-0ubuntu1
  Candidato: 5.22.5-0ubuntu1
  Tabela de Versão:
 *** 5.22.5-0ubuntu1 500
        500 http://pt.archive.ubuntu.com/ubuntu impish/universe amd64 Packages
        100 /var/lib/dpkg/status

What I expected to happen:
Discover is able to search and apply for updates and install regular Ubuntu 
packages

What happened instead:
Discover cannot search for updates and install regular Ubuntu packages for 
apparently not detecting network connection.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: plasma-discover 5.22.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Sat Sep 25 03:14:45 2021
InstallationDate: Installed on 2021-09-24 (0 days ago)
InstallationMedia: Kubuntu 21.10 "Impish Indri" - Beta amd64 (20210924)
SourcePackage: plasma-discover
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: plasma-discover (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish wayland-session

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https://bugs.launchpad.net/bugs/1945030

Title:
  plasma-discover "cannot refresh cache whilst offline"

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