How to Safely Remove Lambda Stack

Hi, I am encountering a bunch of roadblocks due to the Lambda Stack:

• I need to install protobuf official ubuntu bionic version (protoc 3.0.0).
• I need to install TensorRT which collides with some NVIDIA package.

How can I safely remove the Lambda Stack PPA, and potentially the packages it installed?

It would be great if lambda stack would support TensorRT. I tried installing it on my own, but it conflicts with lambda-stack. I might have to remove lambda-stack altogether! 😞