http://stackoverflow.com/questions/28385172/run-button-is-disabled-in-android-studio
http://stackoverflow.com/questions/23688702/cannot-start-compilation-the-output-path-is-not-specified-for-module
http://stackoverflow.com/questions/28140164/android-studio-giving-assertionerror-null-error-in-new-project-creation
http://stackoverflow.com/questions/20063532/assertion-error-in-android-studio-when-trying-to-compile-the-working-project
http://stackoverflow.com/questions/17424135/android-studio-android-manifest-doesnt-exists-or-has-incorrect-root-tag
http://stackoverflow.com/questions/27261474/android-studio-doesnt-see-genymotion
http://stackoverflow.com/questions/36142055/genymotion-device-doesnt-appear-on-device-chooser-android-studio
https://www.genymotion.com/faq/#category-virtual-devices
http://stackoverflow.com/questions/18768489/how-to-start-genymotion-device-with-shell-command
http://askubuntu.com/questions/474836/how-to-run-genymotion-via-terminal
http://stackoverflow.com/questions/25338555/why-it-must-run-genymotion-by-root-in-kde-desktop
http://askubuntu.com/questions/705949/rooted-genymotion
https://teamtreehouse.com/community/how-to-run-from-android-studio-to-genymotion-emulator
I had the same situation. I enabled the plugin (see previous answer), the icon of Genymotion appeared. To see the Genymotion Device in the Devices on the down left corner and being able to run your apps in Genymotion emulator do the following:
Run the Android Studio (don't forget to launch it like admin (right click on the icon). Wait it until it fully loads.
Run Genymotion (not with the icon in Anroid Studio, but from folder where you installed it (also like admin).
Choose the Device in Genymotion and run it. The Genymotion Device schould appear in the down left corner of Android Studio (where the Android view is).
If you still don't see your Genymotion Device in Android Device Monitor or AVD Manager, but you need to set some setting to your device, such as displaying keyboard, you can always set settings for your Device in Genymotion itself.
http://ubuntuforums.org/showthread.php?t=1784835
http://askubuntu.com/questions/256792/how-do-i-enable-hardware-virtualization-technology-vt-x-for-use-in-virtualbox
https://community.linuxmint.com/tutorial/view/1727
https://www.jetbrains.com/help/idea/2016.1/choosing-the-target-device-manually.html
http://stackoverflow.com/questions/28140164/android-studio-giving-assertionerror-null-error-in-new-project-creation
http://stackoverflow.com/questions/20063532/assertion-error-in-android-studio-when-trying-to-compile-the-working-project
Building An Android App That Streams Music In A Background Service
http://erlangerdigital.com/?page_id=240