[xubuntu-users] Something stays running after all closed

[John R. Sowden]

I am trying to upgrade from 16.04 to 18.04 LTS.  In the process, I am 
running programs that I normally do not (gparted, thunar as su).  After 
all programs are closed, I am getting the mouse pointer with a running 
circle.  I run htop, find thunar is taking 10% of the memory and 
--daemon in the command line in htop.  I kill it, the mouse pointer 
stays.  I reboot, mouse pointer is normal. then I run something and I'm 
back.

Am I running something in the background?  How do I find it.  Why is 
thunar running after I closed it?

John