Ubuntu Server LTS 20.04 Can't update

nujpathak@i4planet:~$ sudo apt-get update
Ign:1 http://mirrors.digitalocean.com/ubuntu groovy InRelease
Hit:2 https://repos-droplet.digitalocean.com/apt/droplet-agent main InRelease                                                                                
Ign:3 http://mirrors.digitalocean.com/ubuntu groovy-updates InRelease                                                                                        
Hit:4 https://download.docker.com/linux/ubuntu focal InRelease                                                                                               
Ign:5 http://mirrors.digitalocean.com/ubuntu groovy-backports InRelease                                                                                      
Err:6 http://mirrors.digitalocean.com/ubuntu groovy Release                                                                             
  404  Not Found [IP: 172.67.148.71 80]
Err:7 http://mirrors.digitalocean.com/ubuntu groovy-updates Release                                                                     
  404  Not Found [IP: 172.67.148.71 80]
Hit:8 http://ppa.launchpad.net/ondrej/apache2/ubuntu groovy InRelease                                           
Ign:9 http://download.webmin.com/download/repository sarge InRelease                                            
Err:10 http://mirrors.digitalocean.com/ubuntu groovy-backports Release                    
  404  Not Found [IP: 172.67.148.71 80]
Ign:11 http://security.ubuntu.com/ubuntu groovy-security InRelease  
Hit:13 http://download.webmin.com/download/repository sarge Release 
Err:14 http://security.ubuntu.com/ubuntu groovy-security Release  
  404  Not Found [IP: 91.189.91.38 80]
Ign:12 http://cdn-fastly.deb.debian.org/debian jessie-backports InRelease
Err:16 http://cdn-fastly.deb.debian.org/debian jessie-backports Release
  404  Not Found [IP: 199.232.106.132 80]
Reading package lists... Done
E: The repository 'http://mirrors.digitalocean.com/ubuntu groovy 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 groovy-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 groovy-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 groovy-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://http.debian.net/debian jessie-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.