I think he mentioned it might have problems installing from app manager so use e-term instead.

in x-term type "sudo apt-get -f install" it solved mine for dependencies problems and BTW, you have to manually do "sudo apt-get install kernel-power-settings"

*You must have rootsh installed
*If the above cmd fails then do "sudo gainroot" and type the above cmds without "sudo" and for this you again needs rootsh installed.