install postgis in linux server without desktop

I want to know is there any way can install postgis for postgresql so easily,
just like one click bin on Ubuntu using command line?

I know there is a tool called stack builder which work after version 8.2 for
easily installing extensions, I have tried, but it seem doesnt work under
command line.

I don't know how to install postgis on ubuntu? I go to postgis website and
find the install method is complicated, need me to compile three or more
things.
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