➜ Desktop sudo apt update
[sudo] password for saeed:
Ign:1 https://example.com/apt stable InRelease
Hit:2 https://deb.termius.com squeeze InRelease
Hit:3 http://security.ubuntu.com/ubuntu jammy-security InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu jammy InRelease
Hit:5 https://dl.google.com/linux/chrome/deb stable InRelease
Get:6 https://debrepo.freedownloadmanager.org bionic InRelease [1,706 B]
Err:7 https://example.com/apt stable Release
404 Not Found [IP: 93.184.216.34 443]
Hit:8 http://us.archive.ubuntu.com/ubuntu jammy-updates InRelease
Hit:9 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security InRelease
Hit:10 http://us.archive.ubuntu.com/ubuntu jammy-backports InRelease
Err:6 https://debrepo.freedownloadmanager.org bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 83321298093B2149
Hit:11 https://esm.ubuntu.com/apps/ubuntu jammy-apps-updates InRelease
Hit:12 https://esm.ubuntu.com/infra/ubuntu jammy-infra-security InRelease
Hit:13 https://esm.ubuntu.com/infra/ubuntu jammy-infra-updates InRelease
Reading package lists... Done
E: The repository 'https://example.com/apt stable 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: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://us.archive.ubuntu.com/ubuntu/dists/jammy/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://dl.google.com/linux/chrome/deb/dists/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: GPG error: https://debrepo.freedownloadmanager.org bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 83321298093B2149
E: The repository 'https://debrepo.freedownloadmanager.org bionic InRelease' is not signed.
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: http://us.archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://esm.ubuntu.com/apps/ubuntu/dists/jammy-apps-security/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://us.archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://esm.ubuntu.com/apps/ubuntu/dists/jammy-apps-updates/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://esm.ubuntu.com/infra/ubuntu/dists/jammy-infra-security/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: https://esm.ubuntu.com/infra/ubuntu/dists/jammy-infra-updates/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
➜ Desktop