Question
How can I upgrade ubuntu 18.10 to 19.04 or 20
apt-get update
Hit:1 https://repos.sonar.digitalocean.com/apt main InRelease
Ign:2 http://mirrors.digitalocean.com/ubuntu cosmic InRelease
Ign:3 http://mirrors.digitalocean.com/ubuntu cosmic-updates InRelease
Ign:4 http://mirrors.digitalocean.com/ubuntu cosmic-backports InRelease
Err:5 http://mirrors.digitalocean.com/ubuntu cosmic Release
404 Not Found [IP: 104.24.116.209 80]
Err:6 http://mirrors.digitalocean.com/ubuntu cosmic-updates Release
404 Not Found [IP: 104.24.116.209 80]
Err:7 http://mirrors.digitalocean.com/ubuntu cosmic-backports Release
404 Not Found [IP: 104.24.116.209 80]
Ign:8 http://security.ubuntu.com/ubuntu cosmic-security InRelease
Err:9 http://security.ubuntu.com/ubuntu cosmic-security Release
404 Not Found [IP: 91.189.91.39 80]
Hit:10 http://ppa.launchpad.net/certbot/certbot/ubuntu cosmic InRelease
Reading package lists... Done
E: The repository 'http://mirrors.digitalocean.com/ubuntu cosmic 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 cosmic-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 cosmic-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 cosmic-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.
I know Ubuntu 18.10 is no more supported, but how can I update my source and get 19.04 installed
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