Why can't I apt update in ubuntu 19.04?

Question

linux

When sudo apt update, this list of problems pops up:

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: 91.189.88.142 80]
err:5 archive.ubuntu.com/ubuntu disco-backports InRelease
err:6 archive.ubuntu.com/ubuntu disco -security InRelease
Error:7 archive.ubuntu.com/ubuntu disco Release
404 Not Found [IP: 91.189.88.152 80]
Error:8archive.ubuntu.com/ubuntu disco-updates Release
404 Not Found [IP: 91.189.88.152 80]
Error:9 archive.ubuntu.com/ubuntu disco-backports Release
404 Not Found [IP: 91.189.88.152 80]
Error:10 archive.ubuntu.com/ubuntu disco-security Release
404 Not Found [IP: 91.189.88.152 80]
Reading package lists... Done
E: The " security.ubuntu.com/ubuntu disco-security Release" repository no longer contains a Release file.
N: This repository cannot be updated securely, so it is disabled by default.
N: See the apt-secure(8) man page for information about creating a repository and user settings.
E: The " archive.ubuntu.com/ubuntu disco Release" repository no longer contains a Release file.
N: This repository cannot be updated securely, so it is disabled by default.
N: See the apt-secure(8) man page for information about creating a repository and user settings.
E: The " archive.ubuntu.com/ubuntu disco-updates Release" repository no longer contains a Release file.
N: This repository cannot be updated securely, so it is disabled by default.
N: See the apt-secure(8) man page for information about creating a repository and user settings.
E: Repository " archive.ubuntu.com/ubuntudisco-backports Release" does not contain a Release file.
N: This repository cannot be updated securely, so it is disabled by default.
N: See the apt-secure(8) man page for information about creating a repository and user settings.
E: The " archive.ubuntu.com/ubuntu disco-security Release" repository does not contain a Release file.
N: This repository cannot be updated securely, so it is disabled by default.
N: See the apt-secure(8) man page for information about creating a repository and user settings.

What is going on, how to fix it, I do not understand. Help please, I just started to sit in Linux.

Answer 1

EOL because. https://wiki.ubuntu.com/Releases
Pay attention to release support times. Intermediate releases of ubunta are specifically designed to have short lifetimes.

Answer 2

Isn't 19.04 deprecated?
He was on support only until January 23, 2020.

Answer 3

error 404 - repository unavailable. Change to another. The lists are on the Internet.
A "Updating from this repository cannot be done securely, so it is disabled by default." - you can try adding the line [trusted=yes] to sources.list after the word deb.