From http://people.canonical.com/~ubuntu-archive/livefs-build-logs/maverick/ubuntu/current/livecd-20100928-amd64.out: ... Setting up ubuntu-extras-keyring (2010.09.27) ... Importing extras.ubuntu.com keyring OK Processing extras.ubuntu.com removal keyring OK ...
So that looks correct.
From http:// people. canonical. com/~ubuntu- archive/ livefs- build-logs/ maverick/ ubuntu/ current/ livecd- 20100928- amd64.out: extras- keyring (2010.09.27) ...
...
Setting up ubuntu-
Importing extras.ubuntu.com keyring
OK
Processing extras.ubuntu.com removal keyring
OK
...
So that looks correct.