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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 ...!

mmafshari
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    No, your actual problem is in "problem reporting". What's a "small task"? What version of Ubuntu? – waltinator Aug 04 '18 at 14:11
  • Maybe you're right! In the given example, i need read and write access to /dev/ttyusb* but it won't work anyway unless i run the command sudo arduino or the other situation sudo telegram-desktop ... – mmafshari Aug 04 '18 at 14:16
  • Regarding serial permissions, have a look at this Q&A. When it comes to telegram, find out where it stores the user profile, and check the permissions of this. – vidarlo Aug 04 '18 at 14:23
  • hmm ... i used chmod and changed and everything is ok about telegram. thanks for the link regarding serials i'm checking it out. – mmafshari Aug 04 '18 at 14:43
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    You shall not run Arduino as root (see last paragraph of this answer), you shall not run Telegram as root. It is very likely that you messed your permissions in home folder - revert back them with sudo chown $USER:$USER -R /home/$USER and in future use graphical user applications an normal user (without sudo). – N0rbert Aug 04 '18 at 15:08
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    @N0rbert good call :-) :-) – Rinzwind Aug 04 '18 at 15:50

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Got my answer! The permissions in my home folder was completely messed up! I used sudo chown $USER:$USER -R /home to reset the settings! And I used the complete instructions on this link for Arduino installation and problem regarding serial permissions solved! "umake" did the work!

Special thanks to @N0rbert

mmafshari
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