ERROR E: Unable to locate package apt_pkgW: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial Release' does not have a Release file.E: Failed to fetch http://ppa.launchpad.net/
"/usr/lib/python3.2/threading.py", line 740, in _bootstrap_inner File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 141, in run
self.add_ppa_signing_key(s