I keep getting this message from Update Manager. Should I be concerned?
Could not download all repository indexes
The repository may no longer be available or could not be contacted because of network problems. If available, an older version of the failed index will be used. Otherwise, the repository will be ignored. Check your network connection and ensure the repository address is correct in ‘Repositories’ under ‘Settings’.
Failed to fetch http://packages.medibuntu.org/dists/precise/Release.gpg Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/free/binary-i386/Packages Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/binary-i386/Packages Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/free/i18n/Translation-en_GB Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/free/i18n/Translation-en Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/i18n/Translation-en_GB Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Failed to fetch http://packages.medibuntu.org/dists/precise/non-free/i18n/Translation-en Something wicked happened resolving ‘packages.medibuntu.org:http’ (-5 - No address associated with hostname)
Some index files failed to download. They have been ignored, or old ones used instead.