Hi Everyone, I am running 6.10 ubuntu and was trying to upgrade to 8.04 but, first of all, my update manager only displays 7.04 as an update, and when I try to do that it says that, "Authenticating the upgrade failed. There may be a problem with the network or with the server." what should I do? also, I can't update the applications on my synaptic package manager because, "The repository might be no longer 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 the correct writing of the repository address in the preferences." now, I know my internet is working fine, I'm typing this on that computer. Are these problems related in any way, and how do I fix them?