Linux mint is derived from Ubuntu. Ubuntu is derived from debian. A lot of linux distros are dervied from some other distro. My question is how does they do that.
Many people answer me that they take the work of one distro and modify it for their. But this is not what I want to know. What I want to know is how they actually derive their work.
I want to know the technical process.
For instance suppose I want to build a minimal linux OS based on Ubuntu. Then what should I do?