Installing swi prolog on colab

General
1

Hi,

This code used to work but now fails (first instruction fails):

!apt-add-repository --yes ppa:swi-prolog/stable
!apt-get update
!apt-get install swi-prolog

Traceback (most recent call last):
  File "/usr/bin/apt-add-repository", line 364, in <module>
    sys.exit(0 if addaptrepo.main() else 1)
                  ^^^^^^^^^^^^^^^^^
  File "/usr/bin/apt-add-repository", line 347, in main
    shortcut = handler(source, **shortcut_params)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/softwareproperties/shortcuts.py", line 40, in shortcut_handler
    return handler(shortcut, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 82, in __init__
    if self.lpppa.publish_debug_symbols:
       ^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 120, in lpppa
    self._lpppa = self.lpteam.getPPAByName(name=self.ppaname)
                  ^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 107, in lpteam
    self._lpteam = self.lp.people(self.teamname)
                   ^^^^^^^
  File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 98, in lp
    self._lp = login_func("%s.%s" % (self.__module__, self.__class__.__name__),
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 494, in login_anonymously
    return cls(
           ^^^^
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 230, in __init__
    super(Launchpad, self).__init__(
  File "/usr/lib/python3/dist-packages/lazr/restfulclient/resource.py", line 472, in __init__
    self._wadl = self._browser.get_wadl_application(self._root_uri)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lazr/restfulclient/_browser.py", line 447, in get_wadl_application
    response, content = self._request(url, media_type=wadl_type)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lazr/restfulclient/_browser.py", line 389, in _request
    response, content = self._request_and_retry(
                        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lazr/restfulclient/_browser.py", line 359, in _request_and_retry
    response, content = self._connection.request(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/httplib2/__init__.py", line 1692, in request
    (response, new_content) = self._request(
                              ^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 144, in _request
    response, content = super(LaunchpadOAuthAwareHttp, self)._request(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/lazr/restfulclient/_browser.py", line 184, in _request
    return super(RestfulHttp, self)._request(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/httplib2/__init__.py", line 1444, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/httplib2/__init__.py", line 1366, in _conn_request
    conn.connect()
  File "/usr/local/lib/python3.11/dist-packages/httplib2/__init__.py", line 1156, in connect
    sock.connect((self.host, self.port))
TimeoutError: [Errno 110] Connection timed out
2

Looks like an issue with colab or the Ubuntu PPA repository. Nothing SWI-Prolog can do anything about as far as I can see.

3

Yes, you are right. Now it is working. Thanks