提示访问超时，应该是常见的上网问题

$ rosdep init

ERROR: Rosdep experienced an error: The read operation timed out
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: 0.25.1

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 144, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 448, in _rosdep_main
    return _no_args_handler(command, parser, options, args)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 457, in _no_args_handler
    return command_handlers[command](options)
  File "/usr/lib/python3/dist-packages/rosdep2/main.py", line 601, in command_init
    data = download_default_sources_list()
  File "/usr/lib/python3/dist-packages/rosdep2/sources_list.py", line 326, in download_default_sources_list
    f = urlopen_gzip(url, timeout=DOWNLOAD_TIMEOUT)
  File "/usr/lib/python3/dist-packages/rosdep2/url_utils.py", line 50, in urlopen_gzip
    response = urlopen(url_request, **kwargs)
  File "/usr/lib/python3.10/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.10/urllib/request.py", line 519, in open
    response = self._open(req, data)
  File "/usr/lib/python3.10/urllib/request.py", line 536, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/usr/lib/python3.10/urllib/request.py", line 496, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.10/urllib/request.py", line 1391, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
  File "/usr/lib/python3.10/urllib/request.py", line 1352, in do_open
    r = h.getresponse()
  File "/usr/lib/python3.10/http/client.py", line 1375, in getresponse
    response.begin()
  File "/usr/lib/python3.10/http/client.py", line 318, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.10/http/client.py", line 279, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/lib/python3.10/socket.py", line 705, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib/python3.10/ssl.py", line 1303, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib/python3.10/ssl.py", line 1159, in read
    return self._sslobj.read(len, buffer)
TimeoutError: The read operation timed out

配置git代理，(当然要自己先开一个代理)

$ git config --global http.proxy socks5://192.168.50.128:10808

成功

$ sudo rosdep init
Wrote /etc/ros/rosdep/sources.list.d/20-default.list
Recommended: please run

	rosdep update