I wanna ask why when i use root to do job can't do more one in another places like terminal or ubuntu software center and this message appear "is another process using it"
here is pic to explain what I mean
There is no inherent reason you cannot "do a lot of jobs in the same time".
But some jobs are not meant to run at the same time. This is usually implemented by locking something.
In this case, you can imagine an update needing the current state of your machine, but it has to be sure nothing changed. If you are updating somehting (installing package X) and you run a different update that needs package X as well, it will ALSO try to install that package