Depending on the year of the attachment points are slightly different.
Front bumper
The bumper is easily removed. Unscrew the screws in the wheel arches behind the arch liners (depending on the year the location changes) holding the corners of the bumper to the wings. Unscrew the screws around the perimeter of the bottom (spun up). With the assistant pulls the bumper forward (don't want to break the wires). Remove the fog lamp connectors (if any).
Rear bumper
Open the tailgate and remove the rear trim panel (wagon Unscrew the screws in the opening of the trunk). The plating Unscrew the two nuts and one bolt. Unscrew the screws around the perimeter of the bottom (spun up). Wheel arches, behind the fender liner, Unscrew the screws holding the corners of the bumper to the wings. With the assistant pulls the bumper back.
How to remove front and rear bumper Renault Laguna 2 (2001-2007)
How to remove front and rear bumper Renault Laguna 3 (2007-2015)