When i was under Dapper, i had the same problem : all the new linux-image installed but booting on the old (given with the installation), and impossible to boot on the newest (with yaboot, it is automatic normally).
When i was under Dapper, i had the same problem : all the new linux-image installed but booting on the old (given with the installation), and impossible to boot on the newest (with yaboot, it is automatic normally).