apt update on ubuntu 19 won’t work

when I run apt-update, here is what I get

Hit:1 http://ppa.launchpad.net/ondrej/php/ubuntu eoan InRelease
Ign:2 http://nova.clouds.archive.ubuntu.com/ubuntu eoan InRelease              
Ign:3 http://security.ubuntu.com/ubuntu eoan-security InRelease
Ign:4 http://nova.clouds.archive.ubuntu.com/ubuntu eoan-updates InRelease
Err:5 http://security.ubuntu.com/ubuntu eoan-security Release
  404  Not Found (IP: 91.189.91.38 80)
Ign:6 http://nova.clouds.archive.ubuntu.com/ubuntu eoan-backports InRelease
Err:7 http://nova.clouds.archive.ubuntu.com/ubuntu eoan Release
  404  Not Found (IP: 91.189.91.122 80)
Err:8 http://nova.clouds.archive.ubuntu.com/ubuntu eoan-updates Release
  404  Not Found (IP: 91.189.91.122 80)
Err:9 http://nova.clouds.archive.ubuntu.com/ubuntu eoan-backports Release
  404  Not Found (IP: 91.189.91.122 80)
Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu eoan-security Release' no longer has 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://nova.clouds.archive.ubuntu.com/ubuntu eoan Release' no longer has 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://nova.clouds.archive.ubuntu.com/ubuntu eoan-updates Release' no longer has 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://nova.clouds.archive.ubuntu.com/ubuntu eoan-backports Release' no longer has 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.