Error while upgrading to Precise Beta 2: IOError: [Errno socket error] [Errno -2] Name or service not known http://downloads.sourceforge.net/corefonts/andale32.exe

While Upgrading from Ubuntu 11.10 to Ubuntu Precise Beta 2, the following was shown in the logs :

Setting up update-manager-core (1:0.156.10) ...
Installing new version of config file /etc/update-manager/release-upgrades ...
Setting up update-manager (1:0.156.10) ...
Setting up update-notifier-common (0.119ubuntu6) ...
http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.2.202.228.orig.tar.gz
Traceback (most recent call last):
  File "/usr/lib/update-notifier/package-data-downloader", line 233, 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 954, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python2.7/httplib.py", line 814, in _send_output
    self.send(msg)
  File "/usr/lib/python2.7/httplib.py", line 776, in send
    self.connect()
  File "/usr/lib/python2.7/httplib.py", line 757, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 553, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
IOError: [Errno socket error] [Errno -2] Name or service not known
http://downloads.sourceforge.net/corefonts/andale32.exe
Traceback (most recent call last):
  File "/usr/lib/update-notifier/package-data-downloader", line 233, 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 954, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python2.7/httplib.py", line 814, in _send_output
    self.send(msg)
  File "/usr/lib/python2.7/httplib.py", line 776, in send
    self.connect()
  File "/usr/lib/python2.7/httplib.py", line 757, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 553, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
IOError: [Errno socket error] [Errno -2] Name or service not known
Setting up libiw30 (30~pre9-5ubuntu2) ...
Setting up wireless-tools (30~pre9-5ubuntu2) ...
Setting up libnl-3-200 (3.2.3-2ubuntu2) ...
Setting up libnl-genl-3-200 (3.2.3-2ubuntu2) ...
Setting up libpcsclite1 (1.7.4-2ubuntu2) ...
Setting up wpasupplicant (0.7.3-6ubuntu2) ...
Installing new version of config file /etc/wpa_supplicant/functions.sh ...
Setting up xdg-user-dirs-gtk (0.9-0ubuntu1) ...
Installing new version of config file /etc/xdg/autostart/user-dirs-update-gtk.desktop ...
Setting up intel-gpu-tools (1.2-1) ...
Setting up xdiagnose (2.4) ...

What is this error ??? Is it some kind of Bug ??

N.B.I was having a working Net connection throughout the upgrade.