add section 'Updating apt's package lists'

EOF

```

###Updating `apt's` package lists

###Updating apt's package lists

We are now ready to update our list of packages and take full advantage of `apt`. To do this, we update our local keyring with the 

We are now ready to update our list of packages and take full advantage of `apt`. To do this, we update our local keyring of valid Debian developer gnu pgp signatures using `apt-key update`, and then update with `apt-get update`.

```

apt-key update

apt-get update

```