Could not download all repository indexes

[bb4II3r]

Problem persists when I try downloading any codecs or update my list. Checked my internet connection and proxies. Nothing wrong with them.
"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 in the preferences is correct."
Thanks in advance.

[kostasan]

Have you configured your package manager to use the proxy or only the browser?

Try this:
export http_proxy=http://ypur.proxy.adress:your proxy_port

example
export http_proxy=http://myproxy.home.com:8080

Then try to update again.

[bb4II3r]

I configured my proxy in "Network Proxy". Your method doesn't seem to work. I always fail when downloading the 19th file out of 44.

[kostasan]

Since you can connect to some repositories, one of them must have a problem. Do as it says then, ensure the repository address in the preferences is correct. Or maybe the repository is not longer available...