Can't set desktop background

Desktop Environments XFCE
20

thanks pebcak
this last command you sent - helped.

What i did:

  1. open terminal
  2. run: xfdesktop --quit && xfdesktop --reload
  3. ctrl-z
  4. kill -9 $(jobs -ps)

and I am able to open other apps, terminals and close them clicking in ‘close’ button

so how to automate it?