Question: how are cupboards attached to the wall?
Answer: Tip: Some installers screw a board, called a ledger, along the entire length of the wall to hold the cabinets. The ledger works as long as the wall is flat and plumb. If it's not, you'll need to shim behind the cabinets to align them, and the ledger would get in the way. Place the cabinet on the screws or ledger.