Can I place ceramic tiles on top of my kitchen lino?

It is always recommended that you put down cement board before laying tile. It provides a barrier. If you don't take up the existing floor, you will have about 1/2" difference in floor height.

Must lay tile over 1/2" concrete board.

New tile should not be laid directly on top of the old linoleum, unless the linoleum is well-adhered to a cement subfloor. Tile needs a firm, hard, inflexible substrate. If your linoleum is installed over an old wood floor, a new substrate will need to be installed over the linoleum. Vinyl will require a smooth plywood underlayment, while hard tiles will require a cement backerboard underlayment. This new underlayment will need to be installed first with mortar, then with screws that must penetrate the old linoleum. If your linoleum contains asbestos, these screws must be installed by a professional who can take steps to prevent the asbestos from becoming airborne when the tiles are penetrated.

I wouldnt

Yes, you can! Awesome product (peruse site and videos), and I have personally used the product! http://www.tavytools.com/thin_skin.html

Yes, you can as long as linoleum is firmly adhered. There is an adhesive especially for this use. Ask your tile salesman. I did this 18 years ago in my daughter’s kitchen and it has held up well.