Question

I cannot update from 19.04 to 19.10 - 'no longer has a release file'

I was attempting to upgrade to the latest LTS but, am required to update from 19.04 to 19.10 first. I have apparently missed the window to do so as when I attempt to do so with sudo apt-get update I get this result:

Ign:1 http://mirrors.digitalocean.com/ubuntu disco InRelease
Ign:2 http://mirrors.digitalocean.com/ubuntu disco-updates InRelease
Ign:3 http://mirrors.digitalocean.com/ubuntu disco-backports InRelease
Hit:4 http://apt.postgresql.org/pub/repos/apt disco-pgdg InRelease
Err:5 http://mirrors.digitalocean.com/ubuntu disco Release
  404  Not Found [IP: 104.24.116.209 80]
Err:6 http://mirrors.digitalocean.com/ubuntu disco-updates Release
  404  Not Found [IP: 104.24.116.209 80]
Err:7 http://mirrors.digitalocean.com/ubuntu disco-backports Release
  404  Not Found [IP: 104.24.116.209 80]
Ign:8 http://security.ubuntu.com/ubuntu disco-security InRelease
Hit:9 http://apt.postgresql.org/pub/repos/apt xenial-pgdg InRelease
Err:10 http://security.ubuntu.com/ubuntu disco-security Release
  404  Not Found [IP: 91.189.91.38 80]
Hit:11 http://ppa.launchpad.net/ondrej/nginx/ubuntu disco InRelease
Hit:12 http://nginx.org/packages/ubuntu xenial InRelease
Hit:13 http://ppa.launchpad.net/ondrej/php/ubuntu disco InRelease
Reading package lists... Done
E: The repository 'http://mirrors.digitalocean.com/ubuntu disco 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://mirrors.digitalocean.com/ubuntu disco-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://mirrors.digitalocean.com/ubuntu disco-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.
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.

How can I update my existing release so that I can upgrade to a more current LTS? Thank you!

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Hey @enjoypb - This is an issue that lots of users run into due to the earlier EOL date of Jan 23 2020 for Ubuntu 19.04

To fix your immediate issue though, I believe you can do this:

Add old-releases.ubuntu.com to the /etc/apt/sources.list file

Open up the apt sources file with:

sudo nano /etc/apt/sources.list

Replace all occurrences of archive.ubuntu.com with old-releases.ubuntu.com

For example:

before:

deb http://archive.ubuntu.com/ubuntu disco main universe multiverse restricted

after:

deb http://old-releases.ubuntu.com/ubuntu disco main universe multiverse restricted

Keep in mind that even Ubuntu 19.10 will go to end of life (EOL) in July 2020 https://wiki.ubuntu.com/Releases

I had the same issue but found I had to tweak the ‘/etc/apt/sources.list’ file a bit further.

I was initially getting error messages like:

The repository 'http://gb.archive.ubuntu.com/ubuntu disco Release' no longer has a Release file.

I changed all references to archive.ubuntu.com with old-releases.ubuntu.com in '/etc/apt/sources.list' using :%s/archive.ubuntu.com/old-releases.ubuntu.com/

What I should have done though was:

:%s/gb.archive.ubuntu.com/old-releases.ubuntu.com/