Android Studio Gradle stuck

[postlink] https://the-best-way-of-life-is-islam.blogspot.com/2015/07/android-studio-gradle-stuck.html [/postlink]

I'm a newby in Android Studio but I finally managed to install it under Debian 8.1 following this tutorial: http://ift.tt/1BTjSeG.

I immediately created a project and built it, but gradle is stuck (up to now it's 20 minutes) creating debug sources.

May I ask some help to get it work properly? Thanks!