This question cannot be answered sensibly. A square metre is a measure of area, with dimensions [L2]. A [lineal] metre is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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Lineal metres = Square metres/Width of the boards.
Lineal metres = Square metres/Width of the boards.
The answer will depend on the width of the decking boards.
The abbreviation is m. The word lineal or linear is redundant.
A square metre is a unit of area. A linear metre is a unit of distance. The two units are therefore incompatible.