I think I convinced my brother to help him install Ubuntu since he is having problems with Windows activation, I hope he doesn't get cold feet, he is not so tech savvy and he thinks that he needs some extra knowledge for Linux. He will need some Linux distro soon because he will have projects on his faculty which require it, better to start learning sooner than later.
@nikolal
Ubuntu is perfect for newcomers (although I personally prefer Mint). Anyway, he will have a bad time when he needs to start messing with settings of the OS and need to use CLI. But after a while he will love it (if he persevere)
I'm kinda jealous, my brother never allowed me to introduce him to Linux :(
@Vortax
I feel you, you can't convince them to use Signal and even harder to use different OS which is for non techie same as Windows, they only use it for web browsing. What is your brother doing mostly on his computer? If its web browsing then Mint or Ubuntu are great for him. You can try to sell it as "non-malware" OS, and faster experience overall. If he is gaming then there is nothing you can do to persuade him, you will make him even hate Linux.
@Vortax
True