Linear lighting fixture

FIG. 1 is an isometric view of a top, front, and left side of an ornamental design for a linear lighting fixture;

FIG. 2 is a front elevational view of the linear lighting fixture of FIG. 1 ;

FIG. 3 is a rear elevational view of the linear lighting fixture of FIG. 1 ;

FIG. 4 is a top plan view of the linear lighting fixture of FIG. 1 ;

FIG. 5 is a bottom plan view of the linear lighting fixture of FIG. 1 ;

FIG. 6 is a left side elevational view of the linear lighting fixture of FIG. 1 ; and,

FIG. 7 is a right side elevational view of the linear lighting fixture of FIG. 1 .

The broken lines are for the purpose of illustrating environmental structure and form no part of the claimed design.