Since the first google hit is http://ubuntuforums.org/showthread.php?t=954061 can you share if that is the cure?
So I JUST installed ubuntu through Wubi and I tried installing Adobe
Flash Player through the Terminal and I get this error every time
E: Could not get lock /var/cache/apt/cache/apt/archives/lock - open (11:
Resource temporarily unavailable)
E: Unable to lock the download directory

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic