The jujud binary that is distributed via simplestreams can be built in the archive - its currently done in PPA for older Ubuntu releases as it requires a newer version of golang than we have in 12.04 - but for 14.04 I think the binary is actually picked from the packages in the archive.
I'll let one of the juju-core team respond on why the binary is distributed this way.
@Adam
The jujud binary that is distributed via simplestreams can be built in the archive - its currently done in PPA for older Ubuntu releases as it requires a newer version of golang than we have in 12.04 - but for 14.04 I think the binary is actually picked from the packages in the archive.
I'll let one of the juju-core team respond on why the binary is distributed this way.