Plugin update on multisite installation

Hi guys

Ive got a bunch of updates to install on various sites but none will update. I've got WPMU dashboard installed but it's not visable on any of my single installations or on my multisite installation. I'm getting the following plugin update error;

"An error occurred while updating: Update package not available.."

I hope there's a simple way out rather than uninstalling and reinstalling each plugin.

Larry