ADB No Devices

Best instructions to fix the problem http://ktnr74.blogspot.com/2014/09/the-most-comprehensive-write-up-on-how.html when using adb to control android in ubuntu / debian

You can install the SDK with ADB under Mint / Mate with

apt-get install android-tools-adb

but before you can use the Android Studio you must have Oracle Java JDK (not JRE) installed. The OpenJDK automagically installed doesn’t suffice. So you need to add the Oracle JDK repository (actually a script that will do the install, Oracle apparently does not have a Ubuntu repository for their JDK).

Menu / Administration / Edit / Software Sources and add PPAs

deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

then in the Software Manager search on oracle-java7-installer