I have in installation in which the linux-image-2.6.26-2-xen-amd64 package is "stuck" in aptitude at 2.6.26-25lenny1. There's a -26lenny1 security release that my other installations are seeing. It has no hold on it. Security is in sources.list. "apt-get {update,upgrade}" doesn't change anything. Nor does "apt-get install xen-linux-system-2.6.26-2.-xen-amd64". Ideas?