TLDR
Enter a command. For example: apt add repository, xdg desktop menu.

ubuntu-security-status

 
Display information about security support for installed Ubuntu packages. More information: https://git.launchpad.net/ubuntu/+source/update-manager/tree/ubuntu-security-status.
 
  • Display the number of unsupported packages:
     
    ubuntu-security-status
     
  • List packages that are no longer available for download:
     
    ubuntu-security-status --unavailable
     
  • List third-party packages:
     
    ubuntu-security-status --thirdparty

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