When I attempt to update "Software & Updates" I get "Failed to download repository information" window.

[Robert Pearson]

The error window details are:

E:The repository 'http://ppa.launchpad.net/webupd8team/indicator-kdeconnect/ubuntu cosmic Release' does not have a Release file.

This is probably why the KDE app in the Software Boutique failed to install. The repository is not yet ready for release.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: software-properties-gtk 0.96.27
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Oct 22 10:52:16 2018
ExecutablePath: /usr/bin/software-properties-gtk
InstallationDate: Installed on 2018-10-22 (0 days ago)
InstallationMedia: Ubuntu-MATE 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
InterpreterPath: /usr/bin/python3.6
PackageArchitecture: all
ProcEnviron:
 XDG_RUNTIME_DIR=<set>
 SHELL=/bin/bash
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
Python3Details: /usr/bin/python3.6, Python 3.6.7rc1, python3-minimal, 3.6.6-1
PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal, 2.7.15-3
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

[Hans Joachim Desserud (hjd)]

Thanks for reporting.

The repository mentioned in the error message seems to be a PPA (Personal Package Archive), it is not one of the official Ubuntu repositories. You will probably need to contact the owners of this PPA to get the packages also offered for 18.10 (Cosmic).

[Launchpad Janitor (janitor)]

[Expired for software-properties (Ubuntu) because there has been no activity for 60 days.]