title: App compiles and runs fine, apk builds fine, but IDE says sync failed
body: <p>Android Studio keeps telling me sync failed, the messages window is empty, the gradle console is empty. When I press the button to compile and install, that works fine. I can even build an apk and the apk works fine. </p>
  
  <p>Sync was working fine until a couple of days ago I got a notice that some components had updates, I didn't pay much attention to what was updating. Then this issue started. I usually keep my Android Studio (3.0.1) fairly up to date so it was probably a very recently released update of some component. I'm running this on Ubuntu. I also have another project that shares pretty much every module except for the App module with this one and it doesn't have this issue.</p>
  
  <p>What can I do to figure out why the sync is failing?</p>
  
  <p>Edit: I should probably add that I've done multiple cleans and invalidate and restart. </p>