I have the latest 12.04 version of Ubuntu. Yesterday I installed the latest updates and right away I got this message:

'The following packages requested additional data downloads after package installation, but the data could not be downloaded or could not be processed.

flashplugin-installer

The download will be attempted again later, or you can try the download again now. Running this command requires an active Internet connection.'

I then tried to install the plugin using the apt-get command and here are the results:

```
(.../flashplugin-installer_11.2.202.275ubuntu0.12.10.1_amd64.deb から) flashplugin-installer を展開しています...
update-notifier-common のトリガを処理しています ...
flashplugin-installer: downloading http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.2.202.275.orig.tar.gz
Traceback (most recent call last):
  File "/usr/lib/update-notifier/package-data-downloader", line 234, in process_download_requests
    dest_file = urllib.urlretrieve(files[i])[0]
  File "/usr/lib/python2.7/urllib.py", line 93, in urlretrieve
    return _urlopener.retrieve(url, filename, reporthook, data)
  File "/usr/lib/python2.7/urllib.py", line 239, in retrieve
    fp = self.open(url, data)
  File "/usr/lib/python2.7/urllib.py", line 207, in open
    return getattr(self, name)(url)
  File "/usr/lib/python2.7/urllib.py", line 344, in open_http
    h.endheaders(data)
  File "/usr/lib/python2.7/httplib.py", line 958, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python2.7/httplib.py", line 818, in _send_output
    self.send(msg)
  File "/usr/lib/python2.7/httplib.py", line 780, in send
    self.connect()
  File "/usr/lib/python2.7/httplib.py", line 761, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 571, in create_connection
    raise err
IOError: [Errno socket error] [Errno 101] Network is unreachable
flashplugin-installer (11.2.202.275ubuntu0.12.10.1) を設定しています 

```

When I go to Youtube, there's a message in the right upper corner about installing the missing plugins. When I click on it, there's another message saying that Firefox is checking for the missing plugins but then nothing really happens. It is kind of weird since some flash videos on Youtube work and some do not. 

What could be wrong?

Thank you.