Docker installation failing in Linux Mint when trying to add the repository

I'm trying to install Docker and this is the error I get when I try to do it in Linux Mint.

adib@adib-Inspiron-15-3552:~$ sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   focal \
   stable"
WARNING:root:could not open file '/etc/apt/sources.list.d/additional-repositories.list'


Note that the reason why I have focal is because it's the ubuntu version of ulyana linux mint.