Unpack, modify and repack deb files

There are deb instances where you need to modify some file(s) inside and repack it.

This can be done very easily on Ubuntu and Debian using dkpg-deb

Copy the deb file into a directory
Create the directory structure
```
$ mkdir -p newpack oldpack/DEBIAN
```
Extract the filesystem tree
```
$ dpkg-deb -x file.deb oldpack/
```
Extract the control information files
```
$ dpkg-deb -e file.deb oldpack/DEBIAN
```
Modify what that you need
Repackage the deb file under newpack directory using xz compression
```
$ dpkg-deb -Z xz -b oldpack/ newpack/
```