I have installed Android Studio in /opt folder. Recently after upgrade to 0.8.0 beta it stopped to run. A nice looking exception started to pop up:
com.intellij.ide.plugins.PluginManager$StartupAbortedException: Fatal error initializing ‘com.android.tools.idea.AndroidInitialConfigurator’
Please ready the following post and comments below it carefully: https://code.google.com/p/android/issues/detail?id=66623. If the solution pointed out in comments is not enough for you there is one more thing you need to do to solve it. It is enough to execute following command in /opt folder:
sudo chown USER:GROUP -r android-studio
where USER is your login and GROUP is the group your user belongs to (in my case the same as login). Now your Android Studio should start correctly.