Oh my goodness. I just found out the culprit was the Gnome extension "Multi Monitors Add-On". I had originally installed this extension so that I can have the top bar on both monitors. But after disabling it, right click menus works fine !
I'm going to file a bug report with the author of that extension. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1832449 Title: Right click menu does not appear near the mouse on multi-monitor setup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1832449/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs