cloud - Getting gpg error while installing Apache CloudStack on ubuntu14.04 -

while installing apache cloudstack getting gpg error i.e. no_pubkey bbfcfe5386c278e3 .

    $ echo "deb http://cloudstack.apt-get.eu/ubuntu precise 4.3" > /etc/apt/sources.list.d/cloudstack.list      $ wget -o - http://cloudstack.apt-get.eu/release.asc | sudo apt-key add -      $ apt-get update 

error:

    fetched 4,936 kb in 26s (185 kb/s)                                              reading package lists... done w: gpg error: http://extras.ubuntu.com trusty release: following signatures couldn't verified because public key not available: no_pubkey 16126d3a3e5c1192 w: gpg error: http://cloudstack.apt-get.eu precise release: following signatures couldn't verified because public key not available: no_pubkey bbfcfe5386c278e3 

how resolve gpg error tried add using following commands:

  $ sudo gpg --keyserver pgpkeys.mit.edu --recv-key  bbfcfe5386c278e3    $ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys  bbfcfe5386c278e3 

but nothings works, how resolve issue