this is my first time to install linux on my system, I think there is a lot of mess here and I feel helpless from too many errors I got when trying to update my system, when use terminal with this command:
sudo apt update
I got many errors specially from these 3 types:
knowing that I searched many topics and couldn't solve the problem with my system.
Here's the output I got after writing "sudo apt update"
Ign:1 cdrom://Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412) zesty InRelease
Err:2 cdrom://Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412) zesty Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Ign:3 http://download.videolan.org/pub/debian/stable InRelease
Ign:4 http://deb.torproject.org/torproject.org artful InRelease
Ign:5 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:6 http://download.videolan.org/pub/debian/stable Release
Ign:7 http://eg.archive.ubuntu.com/ubuntu zesty InRelease
Hit:8 http://archive.canonical.com/ubuntu artful InRelease
Hit:9 https://repo.skype.com/deb stable InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Ign:11 http://security.ubuntu.com/ubuntu zesty-security InRelease
Hit:12 http://us.archive.ubuntu.com/ubuntu artful InRelease
Ign:13 http://eg.archive.ubuntu.com/ubuntu zesty-updates InRelease
Hit:14 http://ppa.launchpad.net/atareao/atareao/ubuntu artful InRelease
Hit:15 http://repo.steampowered.com/steam precise InRelease
Err:16 http://deb.torproject.org/torproject.org artful Release
Connection failed [IP: 82.195.75.101 80]
Ign:17 http://eg.archive.ubuntu.com/ubuntu zesty-backports InRelease
Err:18 http://security.ubuntu.com/ubuntu zesty-security Release
404 Not Found [IP: 91.189.91.26 80]
Get:19 http://us.archive.ubuntu.com/ubuntu artful-updates InRelease [81.7 kB]
Hit:20 http://ppa.launchpad.net/atareao/telegram/ubuntu artful InRelease
Hit:21 https://deb.opera.com/opera-stable stable InRelease
Err:22 http://eg.archive.ubuntu.com/ubuntu zesty Release
404 Not Found [IP: 91.189.88.152 80]
Hit:23 https://download.sublimetext.com apt/stable/ InRelease
Err:24 http://eg.archive.ubuntu.com/ubuntu zesty-updates Release
404 Not Found [IP: 91.189.88.152 80]
Hit:25 http://ppa.launchpad.net/atareao/telegram/ubuntu zesty InRelease
Err:26 http://eg.archive.ubuntu.com/ubuntu zesty-backports Release
404 Not Found [IP: 91.189.88.152 80]
Hit:27 http://ppa.launchpad.net/dansmith/chirp-snapshots/ubuntu artful InRelease
Get:28 http://us.archive.ubuntu.com/ubuntu artful-backports InRelease [72.2 kB]
Hit:29 http://ppa.launchpad.net/diesch/testing/ubuntu artful InRelease
Hit:31 http://ppa.launchpad.net/eugenesan/ppa/ubuntu artful InRelease
Get:32 http://us.archive.ubuntu.com/ubuntu artful-security InRelease [78.6 kB]
Hit:33 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu artful InRelease
Hit:34 http://ppa.launchpad.net/i2p-maintainers/i2p/ubuntu artful InRelease
Hit:35 http://ppa.launchpad.net/libreoffice/ppa/ubuntu artful InRelease
Hit:36 http://ppa.launchpad.net/libreoffice/ppa/ubuntu zesty InRelease
Hit:37 http://ppa.launchpad.net/linuxgndu/sqlitebrowser/ubuntu artful InRelease
Hit:38 http://ppa.launchpad.net/linuxgndu/sqlitebrowser-testing/ubuntu artful InRelease
Hit:39 http://ppa.launchpad.net/noobslab/apps/ubuntu artful InRelease
Hit:40 http://ppa.launchpad.net/numix/ppa/ubuntu artful InRelease
Hit:41 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu artful InRelease
Hit:42 http://ppa.launchpad.net/peterlevi/ppa/ubuntu artful InRelease
Hit:43 http://ppa.launchpad.net/pmjdebruijn/darktable-release/ubuntu artful InRelease
Hit:44 http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu artful InRelease
Hit:46 http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu zesty InRelease
Hit:47 http://ppa.launchpad.net/team-xbmc/ppa/ubuntu artful InRelease
Hit:48 http://ppa.launchpad.net/team-xbmc/ppa/ubuntu zesty InRelease
Hit:49 http://ppa.launchpad.net/webupd8team/atom/ubuntu artful InRelease
Hit:50 http://ppa.launchpad.net/webupd8team/atom/ubuntu zesty InRelease
Hit:51 http://ppa.launchpad.net/webupd8team/brackets/ubuntu artful InRelease
Hit:52 http://ppa.launchpad.net/webupd8team/brackets/ubuntu zesty InRelease
Hit:53 http://ppa.launchpad.net/webupd8team/java/ubuntu artful InRelease
Hit:54 http://ppa.launchpad.net/webupd8team/java/ubuntu zesty InRelease
Hit:55 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu artful InRelease
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412) zesty 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.
E: The repository 'http://deb.torproject.org/torproject.org artful 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.
E: The repository 'http://security.ubuntu.com/ubuntu zesty-security 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.
E: The repository 'http://eg.archive.ubuntu.com/ubuntu zesty 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.
E: The repository 'http://eg.archive.ubuntu.com/ubuntu zesty-updates 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.
E: The repository 'http://eg.archive.ubuntu.com/ubuntu zesty-backports 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.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 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-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-stable.list:1 and /etc/apt/sources.list.d/google-chrome.list:3
The error/warning output of repository update command is related to your repository settings. The settings reside inside /etc/apt/sources.list.d/<file> and /etc/apt/sources.list.
First of all you should comment out all repositories located at cdrom since you really don't want to use packages out of your CD-ROM installation media...
The rest of errors is related to either unsecure connection (plain HTTP) or just the repository being dead (404, Release file). You should probably do the same as with the cdrom ones - comment them out.