I get this message:
And it never actually runs on right click + clicking the menu item.
This is a similar problem to what I had. I switched to a browser with no built in flash in it (i.e Firefox, Opera , Vivaldi) and used this guide to install a fresh version of flash (use flashplugin to install it) It appears chrome's built-in one is broken in 19.04. You can also try disabling it and use the method above to reinstall it, although I am not sure if that will work.
Edit: Response to below comment: Unsure. I switched to Firefox. Quantum is relatively fast.
I believe it has to do with the sandbox as --no-sandbox "fixed it" dont use this as a permanent solution though as it is unsafe