Get output stream from QProcess

JonB

As I said many times apt update is only example, and if you use pkexec it will show system popup like on screenshot ...

@jsulm has leapt to my defence :) And as I have said many times, my question is not about apt update but about why you need to run it or anything else sudo from your program? This equally applies if you go pkexec (though the whole point of that is it's part of polkit, and the point of polkit is that you are supposed to configure it so that it does not "show system popup like on screenshot").