Metasploit Install Error

• The command to install the Metasploit framework onUbuntu.

curlhttps://raw.githubusercontent.com/rapid7/metasploit-omnibus/master/config/templates/metasploit-framework-wrappers/msfupdate.erb

msfinstall && \ chmod 755 msfinstall && \ ./msfinstall

• The error I get when I install the Metasploit framework onUbuntu

% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 5495 100 5495 0 0 29385 0 --:--:-- --:--:-- --:--:-- 29385 Adding metasploit-framework to your repository list..gpg: can't connect to the agent: IPC connect call failedUpdating package cache..W: GPG error:http://downloads.metasploit.com/data/releases/metasploit-framework/aptlucid InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CDFB5FA52007B954 E: The repository'http://downloads.metasploit.com/data/releases/metasploit-framework/apt lucid InRelease' is not signed. OK Checking for and installing update.. Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package metasploit-framework