video driver help for effects

The message means that something else is using the package manager at that moment, you need to close any add/remove program, synaptic package manager, repository list or update manager windows that may be open. Sometime some of those programs terminate abnormally and leave the file locked, in those cases I just reboot the system to remove the lock, but a more experienced Ubuntu user may have a simple command that can unlock it for you without requiring a reboot.