You need to add the pgp-key for the ppa in order to have secure access to his repository. Usually you do this by clicking your way to the authors launchpad-page and find it there. Capitanterrex's pgp-key is :
Code:
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.0.10
mI0ESX3RMgEEAKuh19NE6MVmBZ8fxTyjgCTRT2i77yHHseOdJAAglIbsWTuFzAmrLPlTCtP9
XgVDzODlGHCyelnzILs2/nH0CDubxnyY+4tJYNq8b2sz2rG1k6pdwlBd8YaFaumpKLS64cZ8
jEWT2eSqh5pG8wR8EJIoEqE/+HbRXaa2YkrWey6tABEBAAG0LkxhdW5jaHBhZCBQUEEgZm9y
IEd1aWxsZXJtbyBHdXRpw6lycmV6IEhlcnJlcmGItgQTAQIAIAUCSX3RMgIbAwYLCQgHAwIE
FQIIAwQWAgMBAh4BAheAAAoJEA6THOIheJyX+FYD/RyY6zP30vEw8hJoeIUxLMCJKkrkLE7c
w89PJmBn4yuQaRFnlH9iZLtNgNYTtQHKpbPVfMo1JTLECVejsPIm5Gc7ulRdtdjHm1s1N0df
5Py9cEpxYnicR+5LDXNMOexYFbv+oFpAqIIAOC/49rFiBLu2o7FFDANYWajiffMafbHC
=KM8L
-----END PGP PUBLIC KEY BLOCK-----
Copy/paste it into an empty textfile and save it. Then add the key with Administration-->Software Sources-->Authentication-tab (I think it's called). Then refresh synaptic with the ppa-repo added, you should now be able to install cinelerra.
This is standard-procedure for ppa-repos, very nice to have ingrained on the spine if you dabble in bleeding edge stuff/stuff with no official debs for it.
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