W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it_IT) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 3B068FB4789ABE4AEFA3BB491397BC53640DB551 uses weak digest algorithm (SHA1)
W: Errore GPG: https://download.01.org/gfx/ubuntu/15.10/main wily InRelease: Le seguenti firme non sono state verificate perché la chiave pubblica non è disponibile: NO_PUBKEY A496EB03894A3A8D
W: The repository 'https://download.01.org/gfx/ubuntu/15.10/main wily InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Non è disponibile alcuna chiave pubblica per i seguenti ID di chiavi:
A496EB03894A3A8D
W: The repository 'http://ppa.launchpad.net/shnatsel/zram/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/skype-wrapper/ppa/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/thefanclub/grive-tools/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://packagecloud.io/slacktechnologies/slack/debian/dists/jessie/InRelease: Signature by key F86AA916A2195E121AEDB11437BBEE3F7AD95B3F uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/shnatsel/zram/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/shnatsel/zram/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/skype-wrapper/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/skype-wrapper/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/thefanclub/grive-tools/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/thefanclub/grive-tools/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it_IT) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3