This is a problem with the site, not the apt list. OpenDNS reports:
Nameserver trace for medibuntu.org:
* Looking for who is responsible for root zone and followed f.root-servers.net.
* Looking for who is responsible for org and followed tld1.ultradns.net.
* Looking for who is responsible for medibuntu.org and followed ns.cekmedia.de.
Nameservers for medibuntu.org:
* ns.cekmedia.de returned (NORECORDS)
* dns.dunnewind.net returned (NORECORDS)
This is a problem with the site, not the apt list. OpenDNS reports:
Nameserver trace for medibuntu.org:
* Looking for who is responsible for root zone and followed f.root-servers.net.
* Looking for who is responsible for org and followed tld1.ultradns.net.
* Looking for who is responsible for medibuntu.org and followed ns.cekmedia.de.
Nameservers for medibuntu.org:
* ns.cekmedia.de returned (NORECORDS)
* dns.dunnewind.net returned (NORECORDS)
Regards,
Spence