W: GPG error: http://ftp.wa.co.za trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CBCB082A1BB943DB

This might help.

It needs a public key to continue.

  • Thanks simon, followed the instructions on the link and they worked. – daumie Jan 23 '16 at 7:12

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