Can't calculate upgrade

[Hagar55]

I'm running Intrepid for the moment, now and then I have a message saying I need to install some upgrades.
When I open the manager it says I need to do a partial upgrade to install all the packages.
I can install some without the upgrade but not all.
When I say yes to install a partial upgrade I get a message saying Ubuntu can't calculate the upgrade.
Is this going to be a problem when it's time to upgrade to Jaunty ?
I don't feel like trying to install it now because then I have to upgrade to often untill the final release.

[taurus]

Post your /etc/apt/sources.list.

Applications -> Accessories -> Terminal

cat /etc/apt/sources.list

[Hagar55]

the list as requested :

deb http://security.ubuntu.com/ubuntu intrepid-security main restricted
deb-src http://security.ubuntu.com/ubuntu intrepid-security main restricted
deb http://security.ubuntu.com/ubuntu intrepid-security universe
deb-src http://security.ubuntu.com/ubuntu intrepid-security universe
deb http://security.ubuntu.com/ubuntu intrepid-security multiverse
deb-src http://security.ubuntu.com/ubuntu intrepid-security multiverse
deb http://packages.medibuntu.org/ gutsy free non-free
deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu gutsy main
deb http://dl.google.com/linux/deb/ testing non-free
deb http://ppa.launchpad.net/awn-testing/ubuntu hardy main
deb-src http://ppa.launchpad.net/awn-testing/ubuntu hardy main
deb http://ppa.launchpad.net/banshee-team/ubuntu hardy main
deb-src http://ppa.launchpad.net/banshee-team/ubuntu hardy main
deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu hardy main
deb http://download.skype.com/linux/repos/debian/ stable non-free
deb http://ppa.launchpad.net/openoffice-pkgs/ubuntu intrepid main
deb http://wine.budgetdedicated.com/apt intrepid main #WineHQ - Ubuntu 8.10 "Intrepid Ibex"
deb http://ppa.launchpad.net/awn-testing/ubuntu intrepid main
deb-src http://ppa.launchpad.net/awn-testing/ubuntu intrepid main
deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu intrepid main

[taurus]

Are you running intrepid? How come you have repos for gutsy & hardy in there? It is not a good idea to mix releases in /etc/apt/sources.list (although a few would tell you it's okay) because things will break and break fast.

[Hagar55]

I'll remove them and see what happens

[Hagar55]

I get this message when I try to reload the sources:
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 60D11217247D1CFF
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7D2C7A23BF810CD5
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9423A34CCA967634

[taurus]

http://ubuntuforums.org/showthread.php?t=1047743