Installing Docker on Linux Lite

[dissent]

Hi all,

I've installed LinuxLite and I'm trying to install docker.
Usually I've used Ubuntu or Pop!OS and it's installed fine via these instructions:

https://docs.docker.com/engine/install/ubuntu/

However I get to this part:

sudo add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
  stable"

and it fails to add the repository.  I've changed it to:

sudo add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  Buster \
  stable"

That went a little further along but still failed. 

I wonder if anyone has had any success in installing Docker on LinuxLite? 

I'm on an old Macbook Pro 2011 and the OS is running quite nicely apart from this little hurdle and a few little other things I'll work through.

Thank you