I don't know why, but I can only run Telegram with sudo. I just downloaded the tar from desktop.telegram.com and extracted its contents in /usr/local/Telegram.
I can now open the program with:
sudo /usr/local/Telegram/Telegram
but not with
/usr/local/Telegram/Telegram
If I do the second one, I get an error log:
[2016.10.31 12:53:39] Launched version: 10019, alpha: [FALSE], beta: 0, debug mode: [FALSE], test dc: [FALSE]
[2016.10.31 12:53:39] Executable dir: , name:
[2016.10.31 12:53:39] Initial working dir: /home/iguarna/
[2016.10.31 12:53:39] Working dir: /home/iguarna/.local/share/TelegramDesktop/
[2016.10.31 12:53:39] Arguments: "Telegram"
[2016.10.31 12:53:39] FATAL: Could not open '/home/iguarna/.local/share/TelegramDesktop/log_startXX.txt' for writing log!
[2016.10.31 12:53:39] Connecting local socket to /tmp/95578c71afe4942c16be0fb6f3bfa82f-{87A94AB0-E370-4cde-98D3-ACC110C5967D}...
[2016.10.31 12:53:39] This is the only instance of Telegram, starting server and app...
What could be the reason?