1. i tryd 2 things to change the lock-screen background on LMDEx64 cinnamon but nothing worked:
start the "gconf-editor" then go to /desktop/gnome/background and set the key picture_filename as default, using the context menu.
i edit /usr/share/linuxmint/adjustments/gdm3/greeter.gconf-defaults
so this simple task is harder to fix than i thought.
2. other question is how i setup changing backgrounds for my desktop?!
3. the language change doesn't seem to work proper! i try to switch it on the user account menü but it does nothing!
thank you for your help! =]