xubuntu 20.04 can not use double click through touch screen
I installed Aarch64 xubuntu 20.04 on an RK3399 board. And I found that double click via touch screen can not open files on the desktop or in the Thunar. But double click via the touch screen on the window title bar then the window is maximized correctly. Then I test xubuntu 16.04 and 18.04 on the same board. The double click via touch screen works fine on them. Is there any advice to track the problem? I even don't know which log file may relate to this problem.