The documentation says specifically "Move to the releases/amd64/2008.0/ directory" . But there, you will only find outdated stage3 files... This should be changed to "Move to the releases/amd64/current-stage3" On the same page, there is an example saying: # md5sum -c stage3-amd64-2008.0.tar.bz2.DIGESTS stage3-amd64-2008.0.tar.bz2: OK Ideally, this should also be updated to some recent stage3 build.
Please search before reporting; there's already a bug on updating the handbooks. *** This bug has been marked as a duplicate of bug 260403 ***