Ubuntu – find the source code of Ubuntu

source code

I would like to know where to find the source code of Ubuntu.
I'd like to see how far it is "open source".

Linux Kernel Source Code:
```
apt-get source linux-source-3.2.0
```
Where can I find the source code for the Ubuntu Kernel?
Ubuntu Source Code:

Ubuntu archive
Specific Software Source Code:
```
sudo apt-get build-dep $package
```
where package is the program/package's source code you want to adopt.

Then type:
```
apt-get source $package
```
to get the source for that package.

For instance:
```
sudo apt-get build-dep abiword
apt-get source abiword
```