ubuntu@ubuntu:~$ update rosdep
-bash: update: command not found
ubuntu@ubuntu:~$ rosdep update
reading in sources list data from /etc/ros/rosdep/sources.list.d
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml]:
        nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml]:
        nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml]:
        nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml]:
        nonnumeric port: 'port' (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml]:
        Failed to download target platform data for gbpdistro:
        nonnumeric port: 'port'
Query rosdistro index https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml

ERROR: Rosdep experienced an error: nonnumeric port: 'port'
Please go to the rosdep page [1] and file a bug report with the stack trace below.
[1] : http://www.ros.org/wiki/rosdep

rosdep version: 0.21.0

Traceback (most recent call last):
  File "/usr/lib/python3.8/http/client.py", line 865, in _get_hostport
    port = int(host[i+1:])
ValueError: invalid literal for int() with base 10: 'port'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 146, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 441, in _rosdep_main
    return _no_args_handler(command, parser, options, args)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 450, in _no_args_handler
    return command_handlers[command](options)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 659, in command_update
    update_sources_list(success_handler=update_success_handler,
  File "/usr/lib/python3/dist-packages/rosdep2/sources_list.py", line 499, in update_sources_list
    distribution_names = get_index().distributions.keys()
  File "/usr/lib/python3/dist-packages/rosdep2/rosdistrohelper.py", line 69, in get_index
    _RDCache.index = rosdistro.get_index(_RDCache.index_url)
  File "/usr/lib/python3/dist-packages/rosdistro/__init__.py", line 104, in get_index
    yaml_str = load_url(url)
  File "/usr/lib/python3/dist-packages/rosdistro/loader.py", line 48, in load_url
    fh = urlopen(url, timeout=timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/usr/lib/python3.8/urllib/request.py", line 542, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 1362, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
  File "/usr/lib/python3.8/urllib/request.py", line 1288, in do_open
    h = http_class(host, timeout=req.timeout, **http_conn_args)
  File "/usr/lib/python3.8/http/client.py", line 1357, in __init__
    super(HTTPSConnection, self).__init__(host, port, timeout,
  File "/usr/lib/python3.8/http/client.py", line 829, in __init__
    (self.host, self.port) = self._get_hostport(host, port)
  File "/usr/lib/python3.8/http/client.py", line 870, in _get_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
http.client.InvalidURL: nonnumeric port: 'port'