On 23-07-2017 07:17, Long Wind wrote: > only root can use X window in stretch?? > > how to let user use it? Reading the release notes is always a good idea before updating the version (be it with an in-place upgrade or new install). Could be related to this: https://www.debian.org/releases/stable/amd64/release-notes/ch-whats-new.en.html#x-no-longer-requires-root -- Eduardo M KALINOWSKI eduardo@kalinowski.com.br