typo

modules/upgrade_dist.sh

@@ -105,6 +105,7 @@ precheck_upgrade_dist()
     file_must_exists pkgman/${SYS_DIST}_${SYS_VER}.list
     if [[ -z $NO_MAIN_SOURCE ]]; then
         prnt E "A required variable to configure apt is not defined."
+        die 160
     fi
 }