sudo apt-get update giving error.

Error from "sudo apt-get update":

Ign:1 http://security.ubuntu.com/ubuntu disco-security InRelease
Err:2 http://security.ubuntu.com/ubuntu disco-security Release
  404 Not Found [IP: 2620:2d:4000:1::19 80]
Ign:3 http://in.archive.ubuntu.com/ubuntu disco InRelease
Ign:4 http://in.archive.ubuntu.com/ubuntu disco-updates InRelease
Ign:5 http://in.archive.ubuntu.com/ubuntu disco-backports InRelease
Err:6 http://in.archive.ubuntu.com/ubuntu disco Release
  404 Not Found [IP: 2620:2d:4000:1::19 80]
Err:7 http://in.archive.ubuntu.com/ubuntu disco-updates Release
  404 Not Found [IP: 2620:2d:4000:1::19 80]
Err:8 http://in.archive.ubuntu.com/ubuntu disco-backports Release
  404 Not Found [IP: 2620:2d:4000:1::19 80]
Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu disco-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://in.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 'http://in.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 'http://in.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.

Ubuntu 19.04 is no longer supported

And also not able to install streamlit library in 19.04 ubuntu.It is saying
that couldn't find package

On Mon, Jan 23, 2023 at 3:35 PM Jeremy <email address hidden>
wrote:

> Your question #704506 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/704506
>
> Status: Open => Answered
>
> Jeremy proposed the following answer:
> Ubuntu 19.04 is no longer supported
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+question/704506/+confirm?answer_id=1
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+question/704506
>
> You received this question notification because you asked the question.
>

This is now the fourth question that you create for the same problem.

The answer is still the same:

Support for Ubuntu 19.04 (Disco Dingo) has ended three years ago, 23 January 23 2020, see https://wiki.ubuntu.com/Releases

There are two possible solutions:
1. Dump your system and install a supported Ubuntu release from scratch (create backup copies of the files that you want to keep beforehand, that you can restore them afterwards).
or
2. Use workarounds to update your system which is not supported any more, see https://help.ubuntu.com/community/EOLUpgrades

This has already been told by Bashing-om in https://answers.launchpad.net/ubuntu/+question/704503

And by the way, adding pictures to launchpad questions does not work.

It's like looking for Windows updates for Windows 95. They don't exist. The things your system is asking for don't exist... Hence why you are getting a 404 error.

I suggest you wipe the install off and do a clean install of 22.04. Ubuntu 22.04 is LTS and supported until April 2027.