Similarly:
kekun@norfair ~ sudo add-apt-repository https://ci.puri.sm/ Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 95, in <module> sp = SoftwareProperties(options=options) 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 93, in get_sources (self.id, self.codename)) aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for PureOS/amber