Steam setup updating system
Steam is easily the most popular PC gaming client available today.
Installing it on Debian Stretch is very easy, especially considering Debian is the basis for Valve's Steam OS.
The update also added Xbox 360, Xbox One, and Generic X-Input controller configuration support, which was made available in beta earlier this month.
It also added additional support for third party PS4 controllers and fight sticks.
If the problem still persists, perhaps you should temporarily uninstall your antivirus or switch to a different security software.
If adding Steam to list of exceptions doesn’t work, disable your antivirus and try running Steam again.
For various PC problems, we recommend to use this tool.