Error: apt-get install failed - when installing VESTA on ubuntu 18.04 - How to fix?

Question

ubuntu

Error: apt-get install failed - writes when installing the vesta panel... already tried different options, one of the last ones is6
sudo apt-get install nmap
then entered - sudo apt-get update
then entered - sudo apt-get upgrade
and installed like this and it doesn't go... here's a screenshot.

Answer 1

Try like this:

gpg --receive-keys <ключ из ошибки NO_PUBKEY>
gpg --export <ключ из ошибки NO_PUBKEY> | sudo apt-key add -

Usually this solves the problem with the keys.