Download the Linux installer from the NuSphere website ( www.nusphere.com )

$ chmod a+x ./NuSphere-phped-3.3.3evl-Linux.sh
$ ./NuSphere-phped-3.3.3evl-Linux.sh

If you get an error similar to the following

ERROR: The installer was unable to find shared libraries which are required
in order to run PhpED.

You should have these libraries installed:
/usr/lib/libstdc++-libc6.1-1.so.2
/usr/lib/libstdc++-libc6.2-2.so.3
-e
To get these libraries installed you may need to install the package which
contains them. It may be named as libstdc++2.10-2.96, compat-libstdc++-7.3-2.96
or have a different name, dependant on your Linux distribution. If you will have
any problems, you may consult your Linux manual or get help from
http://support.nusphere.com forums.

$ cd /usr/lib
$ sudo ln -s libstdc++.so.6.0.10 libstdc++-libc6.1-1.so.2
$ sudo ln -s libstdc++.so.6.0.10 libstdc++-libc6.2-2.so.3

cd back to where you downloaded the installer to. In my case it is as follows

$ cd ~/Desktop
$ ./NuSphere-phped-3.3.3evl-Linux.sh

If you get another error

error while loading shared libraries: libgtk-1.2.so.0

Then install the following

$ sudo apt-get install libgtk1.2

Then go back and try the installer again.

$ ./NuSphere-phped-3.3.3evl-Linux.sh

From here just follow the prompts and it should work fine.