Cannot download system images in Android Studio 3.0 AVD Manager or SDK Manager

Issue

When I try to list and download system images in AVD Manager, nothing shows up in the list. See below:
None of the three tabs show the images, even after I hit refresh. I have made sure I have a working fast Internet connection. I have checked the SDK Manager also. Nothing related to system images is there for download. My list of SDK update sites is as follows (https://dl.google.com/android/repository/repository2-1.xml and a local repo on my system):

Solution

First remove Android settings directory. Make sure Android Studio is closed. On Linux you can run:

sudo rm -rf ~/.android 

Now, launch Android Studio and Download links should be available for system images both in AVD Manager and SDK Manager.

Answered By - Mehdi Haghgoo