وقتی دستور sudo apt-get update میزنم خروجی که بر میگردونه اینه:
Ign:1 cdrom://Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423) focal InRelease
Err:2 cdrom://Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423) focal Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://ppa.launchpad.net/daniruiz/flat-remix/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:5 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease
Ign:6 http://old-releases.ubuntu.com/ubuntu focal InRelease
Ign:7 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu focal InRelease
Ign:8 http://ppa.launchpad.net/noobslab/macbuntu/ubuntu focal InRelease
Hit:9 http://archive.canonical.com/ubuntu focal InRelease
Ign:10 http://old-releases.ubuntu.com/ubuntu focal-updates InRelease
Hit:11 http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease
Hit:12 http://packages.microsoft.com/repos/code stable InRelease
Ign:13 http://old-releases.ubuntu.com/ubuntu focal-backports InRelease
Ign:14 http://old-releases.ubuntu.com/ubuntu focal-security InRelease
Hit:15 http://ppa.launchpad.net/starlabs/ppa/ubuntu focal InRelease
Ign:16 http://ppa.launchpad.net/tista/adapta/ubuntu focal InRelease
Err:17 http://old-releases.ubuntu.com/ubuntu focal Release
404 Not Found [IP: 91.189.88.247 80]
Err:18 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Err:19 http://old-releases.ubuntu.com/ubuntu focal-updates Release
404 Not Found [IP: 91.189.88.247 80]
Err:20 http://ppa.launchpad.net/noobslab/macbuntu/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Err:21 http://old-releases.ubuntu.com/ubuntu focal-backports Release
404 Not Found [IP: 91.189.88.247 80]
Err:22 http://old-releases.ubuntu.com/ubuntu focal-security Release
404 Not Found [IP: 91.189.88.247 80]
Err:23 http://ppa.launchpad.net/tista/adapta/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423) focal 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://old-releases.ubuntu.com/ubuntu focal 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://ppa.launchpad.net/mc3man/xerus-media/ubuntu focal 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://old-releases.ubuntu.com/ubuntu focal-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://ppa.launchpad.net/noobslab/macbuntu/ubuntu focal 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://old-releases.ubuntu.com/ubuntu focal-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.
E: The repository 'http://old-releases.ubuntu.com/ubuntu focal-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://ppa.launchpad.net/tista/adapta/ubuntu focal 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.