Is there a command similar to "wm_overrideredirect" for Ubuntu? I want My program to be displayed without the standard window.
Ubuntu's desktop manager is Gnome, which should support wm_overrideredirect as well as any other.  What's going wrong for you when you try that?  Can you show (by editing your Q) some as-tiny-as-possible Python/Tkinter script that does not behave the way you want, and tell us how it does behave and how you'd like to behave?
Tkinter removing standard window in Ubuntu