Tried to reinstall install the original kernel using the command above but get the error message:

Reading package lists... Done
Building dependency tree
Reading state infomation... Done
Reinstallation of kernel is not possible, it cannot be downloaded.
Reinstallation of kernel-flasher is not possible, it cannot be downloaded.

I am connected to my network before anyone asks, and I can access application manager (and download/install stuff), so are the files missing from the repo or something????

Any thoughts?