Comment 11 for bug 1945661

I ran into this too. We determined that something was setting up my DISPLAY variable which is how X11 knows where to send X11 GUI windows. When I unset that environment variable and tried again, the openstack client command worked. My environment had not changed, however we had upgraded the target openstack cluster from Ussuri to Yoga. It appears in newer openstack versions, something tries to be helpful and (perhaps?) paste the results of an openstack CLI command to the X11 paste buffer (aka clipboard)? Sorry I don't know more about this, but wanted to share an easy fix!