[Ubuntu-BD] Some basic questions

[Junayeed Ahnaf]

Here i am asking some basic questions which i haven't got answered:

1. After i compile a soft and it does not appear in the application
menu, is it possible for someone to put the soft at the list manually.
If yes, then how?
2. Can i replace bash commands with windows commands? Like replace ls with dir?
3. Can i erase Ubuntu completely and restore windows on a hard
drive?(Installed Ubuntu as a partition)
4. Is it possible to install fluxbox or lxde on top of an existing
Ubuntu?(GNOME)

5. Can i enable other debian based distro's repo(e.g mint) in Ubuntu?
-- 
Yours ever-
Junayeed Ahnaf Nirjhor
Mobile number-01673911916