You need to copy the material.

1. To do this, select all the cubes.
2. Next also select the cube with the texture(be sure to do that one last). The cube with the textures should have a light orange background instead of a dark orange.
3. Finally press Ctrl-L->Materials.

Done!

You need to copy the material.

1. To do this, select all the cubes.
2. Next also select the cube with the texture(be sure to do that one last). The cube with the textures should have a light orange background instead of a dark orange.
3. Finally press Ctrl-L->Materials.
4. To copy the UV unwrap, use Ctrl-L->Transfer UV maps

Done!