$ sha256sum linux-image-3.15.0-031500rc8-generic_3.15.0-031500rc8.201412041841_amd64.deb 6f439a83a76b0a5f7f614ecf2d57879e934ee5448095924266934f8f7e47e3de linux-image-3.15.0-031500rc8-generic_3.15.0-031500rc8.201412041841_amd64.deb
is good.
$ sha256sum linux-image- 3.15.0- 031500rc8- generic_ 3.15.0- 031500rc8. 201412041841_ amd64.deb f7f614ecf2d5787 9e934ee54480959 24266934f8f7e47 e3de linux-image- 3.15.0- 031500rc8- generic_ 3.15.0- 031500rc8. 201412041841_ amd64.deb
6f439a83a76b0a5
is good.