desktop shell switching

[yookoala]

Is there any way I can switch my desktop shell from unity to, say, gnome-shell? I can switch using other console shell I like (bash, csh, fish, etc.). Assume that there is a stable alternative desktop shell, I should be able to choose, too.

(For console shell, we goes to /etc/passwd. But for desktop, I can't find the way to config.)

[mcduck]

You can select if from the login screen. There's a "Session" option at the bottom of the screen after you've selected a user (but before typing in the password).

[Copper Bezel]

Notice, though, that you can't run Unity and Gnome Shell installed on the same system, because they depend on different versions of Gnome. Still, there are a wide variety of desktop environments to choose from, and most won't conflict with one another.