14.04 - Unable to add PUBKEY from servers to install or update software - Ask Ubuntu


environment:

  • ubuntu 14.04
  • proxy

i'm following instructions install mono in linux mono-project.

i'm trying download key new repository receive keyserver error. tried other servers same result.

$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3fa7e0328081bff6a14da29aa6a19b38d3d831ef executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.txs8wuxe5s --no-auto-check-trustdb --trust-model --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3fa7e0328081bff6a14da29aa6a19b38d3d831ef gpg: requesting key d3d831ef hkp server keyserver.ubuntu.com gpg: keyserver timed out gpg: keyserver receive failed: keyserver error 

when update repositories gpg errors, , asking not authenticated software

$sudo apt-get update ... w: gpg error: http://download.mono-project.com wheezy inrelease: following signatures couldn't verified because public key not available: no_pubkey a6a19b38d3d831ef 


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