bikepride@En-Comu:~$ sudo apt update && sudo apt -y upgrade
Ign:1 cdrom://Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2) xenial InRelease
Err:2 cdrom://Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2) xenial Release
  Usare apt-cdrom per far riconoscere questo CD-ROM da APT. apt-get update non può essere usato per aggiungere nuovi CD-ROM
Trovato:3 http://it.archive.ubuntu.com/ubuntu xenial InRelease
Scaricamento di:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Trovato:5 http://archive.canonical.com/ubuntu xenial InRelease                 
Trovato:6 http://it.archive.ubuntu.com/ubuntu xenial-updates InRelease         
Lettura elenco dei pacchetti... Fatto                                          
E: The repository 'cdrom://Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2) xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details