When Attempting the procedure detailed at https://wiki.ubuntu.com/Testing/EnableProposed: Here is my result: # sudo aptitude install update-notifier-common/precise-proposed The following packages will be upgraded: update-notifier-common The following partially installed packages will be configured: ttf-mscorefonts-installer update-notifier 1 packages upgraded, 0 newly installed, 0 to remove and 24 not upgraded. Need to get 0 B/221 kB of archives. After unpacking 0 B will be used. Do you want to continue? [Y/n/?] Y Setting up update-notifier-common (0.119ubuntu8.2) ... ttf-mscorefonts-installer: downloading http://downloads.sourceforge.net/corefonts/andale32.exe 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 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 Traceback (most recent call last): File "/usr/lib/update-notifier/package-data-downloader", line 296, in process_download_requests() File "/usr/lib/update-notifier/package-data-downloader", line 292, in process_download_requests trigger_update_notifier(our_failures) File "/usr/lib/update-notifier/package-data-downloader", line 150, in trigger_update_notifier {'packages' : ", ".join(packages)})) File "/usr/lib/python2.7/string.py", line 172, in substitute return self.pattern.sub(convert, self.template) File "/usr/lib/python2.7/string.py", line 162, in convert val = mapping[named] KeyError: 'paquetes' dpkg: error processing update-notifier-common (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of ttf-mscorefonts-installer: ttf-mscorefonts-installer depends on update-notifier-common (>= 0.119ubuntu2); however: Package update-notifier-common is not configured yet. dpkg: error processing ttf-mscorefonts-installer (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of update-notifier: update-notifier depends on update-notifier-common (= 0.119ubuntu8.4); however: Version of update-notifier-common on system is 0.119ubuntu8.2. dpkg: error processing update-notifier (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: update-notifier-common ttf-mscorefonts-installer update-notifier E: Sub-process /usr/bin/dpkg returned an error code (1) A package failed to install. Trying to recover: dpkg: dependency problems prevent configuration of update-notifier: update-notifier depends on update-notifier-common (= 0.119ubuntu8.4); however: Version of update-notifier-common on system is 0.119ubuntu8.2. dpkg: error processing update-notifier (--configure): dependency problems - leaving unconfigured Setting up update-notifier-common (0.119ubuntu8.2) ... ttf-mscorefonts-installer: downloading http://downloads.sourceforge.net/corefonts/andale32.exe 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 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 Traceback (most recent call last): File "/usr/lib/update-notifier/package-data-downloader", line 296, in process_download_requests() File "/usr/lib/update-notifier/package-data-downloader", line 292, in process_download_requests trigger_update_notifier(our_failures) File "/usr/lib/update-notifier/package-data-downloader", line 150, in trigger_update_notifier {'packages' : ", ".join(packages)})) File "/usr/lib/python2.7/string.py", line 172, in substitute return self.pattern.sub(convert, self.template) File "/usr/lib/python2.7/string.py", line 162, in convert val = mapping[named] KeyError: 'paquetes' dpkg: error processing update-notifier-common (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of ttf-mscorefonts-installer: ttf-mscorefonts-installer depends on update-notifier-common (>= 0.119ubuntu2); however: Package update-notifier-common is not configured yet. dpkg: error processing ttf-mscorefonts-installer (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: update-notifier update-notifier-common ttf-mscorefonts-installer