Ubuntu is really a feast for the eyes.
Brother Bird’s book takes centos5 as an example. If you want to be the same as the environment in the book, it is recommended to download an everything version of cenont5+. If you just learn shell, ubuntu can do it. Only ubuntu comes with less software. Therefore, when running some commands, such as ssh and g++, an error will be reported. At this time, you have to install these yourself. The directory structure is similar.