Ubuntu – Gradle project refresh failed- Android Studio 2.2

I would suggest to check the installation directory for a readme or an uninstall script but in general: do what you did to install it in reverse order and delete everything you added as a setting or as a file on your system related to that installation.

Installations done with a tar file are mosttimes uninstalled with the rm command. You go to the directory where you went for this: "Unpack the downloaded Tar file, android-studio-ide--linux.zip, into an appropriate location for your applications" and rm the files and directories created here.

If you did "You may want to add android-studio/bin/ to your PATH environmental" too you will need to undo this alteration by deleting android-studio/bin/ from the file you added this PATH too.

Either the file <your_installation_path>/android-studio/lib/bootstrap.jar does not exist or has the wrong ownership.

Because the installation is located in your home directory, execute the following command that will give your user ownership:

sudo chown -R $USER:$USER <your_installation_path>/android-studio/

If that does not work, check if the file android-studio/lib/bootstrap.jar exists. If not, then download and extract the archive again.