trying to add webupd8team/java PPA to my system

hey guys,
i'm trying to install netbeans on my newly installed mx-linux,

i found this link: https://www.tecmint.com/install-netb...an-linux-mint/

i didn't find any information about mx specificly,

when trying to add the ppa using this command: sudo add-apt-repository ppa:webupd8team/java

i got this: sudo: add-apt-repository: command not found

what should i do?