Can't sudo apt update on JINO server, what should I do?

Question

ubuntu

[email protected]:/# sudo apt update
Ign:1 archive.ubuntu.com/ubuntu disco InRelease
Ign:2 security.ubuntu.com/ubuntu disco-security InRelease
Ign:3 archive.ubuntu.com/ubuntu disco-updates InRelease
Err :4 security.ubuntu.com/ubuntu disco-security Release
404 Not Found [IP: 91.189.88.152 80]
Ign:5 archive.ubuntu.com/ubuntu disco-backports InRelease
Err:6 archive.ubuntu.com/ubuntu disco Release
404 Not Found [IP: 91.189.88.142 80]
Err:7 archive.ubuntu.com/ubuntu disco-updates Release
404 Not Found [IP: 91.189.88.142 80]
Err:8 archive.ubuntu.com/ubuntu disco-backports Release
404 Not Found [IP: 91.189.88.142 80]
Reading package lists... Done
E: The repository ' security.ubuntu.com/ubuntu disco-security Release' does do 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 ' archive.ubuntu.com/ubuntu disco 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 ' archive.ubuntu.com/ubuntu disco-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 ' archive.ubuntu.com/ubuntu disco-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.

Answer 1

support for ubuntu version of Disco Dingo (19.04) ended on January 23, 2020 .
all disco repositories have been disabled for a long time. you can look at archive.ubuntu.com/ubuntu/dists
yourself to upgrade to at least 20.04 (it is LTS, that is, long support time) or what
do-release-upgrade -c will offer you