Right now I am creating a new vbox with ubuntu 18.04 LS to see if it works and to see if it gives me the error previously indicated.
I state that 1 year ago I was using ubuntu 18.04 and I had no problems, then for reasons of space I had to delete it and now I created it with ubuntu 21, but this error occurred.
i read that python 2.7 is no longer supported by ubuntu 20 and 21, so i think my problem is this, i have installed a new version of ubuntu which doesn’t support python2.7 and consequently it creates me that error