why i cant upgrade, i tried to uninstall by taping nokia kernell on the menu but the error is "error during uninstallation: could not install nokia kernel."

i tried in x term. "apt-get install kernel-power-bootimg"
got unmet dependencies; kernel-power-modules (=1:2.6.28-10power50) but 1:2.6.28-10power49 is to be installed