There are several problems I have encountered within my installation of RealPlayer on linux. Here I post the solutions.
a)cannot get source for realplay
Solution 1: edit your apt source, maybe it will be OK
Solution 2: download the program from guide.real.com, no problem
b)cannot start realplay after installation
Solution: edit the shell script /%installation path%/realplay, add "export GTK_IM_MODULE=xim" after script head(the first line), maybe it works
c)cannot get fluent vedio
Solution: install "alsa-oss" with apt, and start your realplay with "aoss %program-name%", maybe it works, you can also change shell script with add "aoss " to line " $REALPLAYBIN "$@" "(about line 70)