ensure previous setup outcomes are cleared

setup/so-setup

@@ -132,6 +132,10 @@ if [[ -f /root/accept_changes ]]; then
 	reset_proxy
 fi
 
+# Previous setup attempts, even if setup doesn't actually start the installation,
+# can leave behind results that may interfere with the current setup attempt.
+clear_previous_setup_results
+
 title "Parsing Username for Install"
 parse_install_username