Running software-properties-kde from terminal, or from Discover, leads to the following crash.
Lastest Neon/User
$ kdesudo software-properties-kde QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' Traceback (most recent call last): File "/usr/bin/software-properties-kde", line 148, in <module> app = SoftwarePropertiesKDE(datadir=data_dir, options=options, file=afile, attachWinID=attachWinID) File "/usr/lib/python3/dist-packages/softwareproperties/kde/SoftwarePropertiesKDE.py", line 62, in __init__ SoftwareProperties.__init__(self, options=options, datadir=datadir) File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__ self.reload_sourceslist() File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist self.distro.get_sources(self.sourceslist) File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 89, in get_sources (self.id, self.codename)) aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for neon/xenial