install Realplayer in Ubuntu

edit the /etc/apt/sources.list file and add the followings:

deb http://archive.canonical.com/ubuntu dapper-commercial main

then update

$ sudo apt-get update
$ sudo apt-get install realplay

Internet Explorer Installation in Ubuntu
Open /etc/apt/sources.list file

$ sudo vi /etc/apt/sources.list

add or Uncomment following lines

deb http://uk.archive.ubuntu.com/ubuntu dapper universe
deb-src http://uk.archive.ubuntu.com/ubuntu dapper universe
deb-src http://wine.budgetdedicated.com/apt dapper main

run to take your new Repository

$ sudo apt-get update
$ sudo apt-get install wine cabextract

$ wget http://www.tatanka.com.br/ies4linux/downloads/ies4linux-2.0.3.tar.gz
$ tar xzvf ies4linux-2.0.3.tar.gz
$ cd ies4linux-2.0.3
$./ies4linux

To run IE you need to run the following command

$/root/bin/ie6