I'm somewhat newbie, so sorry to ask this silly question.
I have recently installed Ubuntu 18. I have two problems with permissions. First of all, Telegram won't open unless you run the sudo command in terminal and it gets the permissions! And the second, after installing Arduino, I need so much permissions! But i get the error message Permission denied; and i have changed the user group to "dialot" but still get the same error!
Please help ...!