root@ubuntu:~# sudo add-apt-repository cloud-archive:tools
 Ubuntu Cloud Archive for cloud-tools (JuJu and MAAS)
 More info: https://wiki.ubuntu.com/ServerTeam/CloudArchive
Press [ENTER] to continue or ctrl-c to cancel adding it

Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 163, in <module>
    if not sp.add_source_from_shortcut(shortcut, options.enable_source):
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 727, in add_source_from_shortcut
    (deb_line, file) = shortcut.expand(codename=self.distro.codename)
  File "/usr/lib/python3/dist-packages/softwareproperties/cloudarchive.py", line 99, in expand
    if codename not in (MAP[self.caname]['release'],
KeyError: 'release'
root@ubuntu:~#