Add this repo to /etc/apt/sources.list

nano /etc/apt/sources.list
deb http://deb.openswitch.net/stretch 3.2.1 opx opx-non-free

Now run:

sudo apt update

You will receive an error like this:

“The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 5EF20F34AD2074F “

Copy the characters after NO_PUBKEY from the last command and use it below YOUR PUBKEY WILL BE DIFFERENT

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5EF20F34AD2074F1

Now that you have the correct signautures your command should be successful

sudo apt update
sudo apt install opx-dell-vm

or depending on what you are doing….

sudo apt install opx-core

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