Keep the Nokia repositories but disable them. The idea is that Nokia might give you an errorneous IP address at the moment. It seems that I'm getting a different IP address now as well as they are doing some modifications on the repositories right now. Moving servers or something like that. Keep the old ones as you should use the domain address, not the IP address if it changes later on. This is just a temporary fix. In the temporary repositories you'll have to use the same settings, but change the downloads.maemo.nokia.com to 206.132.241.74. Name the repository differently, like Nokia backup or something. The name should not matter.