install telegram on Ubuntu 16.04 [duplicate]

After installing Telegram Desktop on Ubuntu 16.04 by these commands:

sudo add-apt-repository ppa:atareao/telegram
sudo apt-get update
sudo apt-get install telegram

I get this error:

$ telegram
telegram: Panic - Unable to find your tty (pts/2) in /var/run/utmp

Telegram Desktop

Please use either

• https://telegram.org/dl/desktop/linux (64bit) or
• https://telegram.org/dl/desktop/linux32 (32bit)

Telegram Web

Telegram offers as well a Webinterface and a Chrome app.

More

A list of official and unofficial clients can be found here.

Special-Case: Franz

I am using Franz myself, as it covers several Messengers (Skype, Whatsapp, Telegram, Slack, FB-Messenger etc) in 1 client.