improved code quality, few bug fixes

modules/install_desktop.sh

@@ -24,12 +24,12 @@ install_desktop()
 	prnt I "Installing additionnal X11 drivers..."
 	pkginst $X11_DRV
     fi
-    if [[ $UBUNTU_FLAVOR ]]; then
+    if [[ -n $UBUNTU_FLAVOR ]]; then
 	prnt I "Installing $UBUNTU_FLAVOR environment..."
 	pkginst ${UBUNTU_FLAVOR}-desktop
     fi
     # Because we're lazy but manual actions can avoid reboot...
-    NEED_REBOOT=true
+    export NEED_REBOOT=true
 }
 
 precheck_install_desktop()