Have you tried installing? I could not get.
Here is a log:
oleg@oleg-PC:~/Desktop$ echo "deb https://pkg.tox.chat/debian stable $(lsb_release -cs)" | sudo tee /etc/apt/sources.list.d/tox.list
[sudo] password for oleg:
deb https://pkg.tox.chat/debian stable unstable
oleg@oleg-PC:~/Desktop$ wget -qO - https://pkg.tox.chat/debian/pkg.gpg.key | sudo apt-key add -
OK
oleg@oleg-PC:~/Desktop$ sudo apt-get install apt-transport-https
Reading package lists... Done
Building dependency tree      
Reading state information... Done
apt-transport-https is already the newest version (1.4+deepin2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
oleg@oleg-PC:~/Desktop$ sudo apt-get update
Get:1 http://repository.spotify.com stable InRelease [3,302 B]
Get:2 http://repository.spotify.com stable/non-free i386 Packages [1,140 B]               
Get:3 http://repository.spotify.com stable/non-free amd64 Packages [1,601 B]
Get:4 https://pkg.tox.chat/debian stable InRelease [16.9 kB]
Hit:5 http://packages.deepin.com/deepin panda InRelease   
Fetched 23.0 kB in 2s (8,045 B/s)
Reading package lists... Done
oleg@oleg-PC:~/Desktop$ sudo apt-get install qtox
Reading package lists... Done
Building dependency tree      
Reading state information... Done
E: Unable to locate package qtox

what am I doing wrong?

是不是包的名字不对

Edited by oleg_kykyshka at 2017-12-11 22:02

which package name is correct?
please write instructions on how to install qTox on Deepin 15.5.
Thanks.