web Site. Development

[manlug]

Hi,
in the section Development of Web Site: WEB
show:
$ sudo apt upgrade $ curl -sL 'https://keyserver.ubuntu.com/pks/lookup&op=get&search=0x73BC8FBCF5DE40C6ADFCFFFA9C949F2093F565FF' | sudo apt-key add
no work.

Solved:
curl -sL 'https://keyserver.ubuntu.com/pks/lookup?search=0x73BC8FBCF5DE40C6ADFCFFFA9C949F2093F565FF&hash=on&op=get' | sudo apt-key add