I feel like a failure for not being able to find the answer on the internet. There must have been someone in history of internet asking this. But I couldnt, so here we go:
I have an old macbook air with macOS and ubuntu installed on the same hard drive. This macbook has 64GB internal SSD so little for my engineering work, I need heavy apps installed on the machine, so I bought a 512GB nvme SSD to have this extra space for apps and personal files obviously.
How could I have linux on the internal SSD being able to have its apps files installed on the external SSD?
I think the question would be how to have the root for all the system libraries in the internal SSD and app binaries on external SSD? Please correct me if Im wrong and please give the most information I want to learn linux. Maybe Im a hard head for informatics.
Installing apps on separate hard drive This answer is poor and I think doesnt relate directly to my problem as I need /usr to be on a diferent drive? If my terminology is wrong please correct me.