refactor README.md mainly for Linux users ...

Author: Aranuvir

README.md

@@ -30,10 +30,10 @@ Builds for Windows platforms can be downloaded from http://www.makehumancommunit
 
 If you rather run the code from source:
 
-* Install git (https://git-scm.com/) with LFS support (https://git-lfs.github.com/). Modern git clients have LFS support included per default. 
-* Make sure the command "git" is available via the PATH variable.
 * Install python 3.6.x or later from https://www.python.org/ (or via your system's package management). On windows you **MUST** use 64-bit python. 32-bit python will not work.
 * Install python dependencies (see the [Installing python dependencies](#installing-python-dependencies) section below)
+* Install [git](https://git-scm.com/) with [LFS support](https://git-lfs.github.com/). Modern git clients have LFS support included per default. 
+* Make sure the command "git" is available via the PATH variable.
 * Use git to clone https://github.com/makehumancommunity/makehuman.git (or download the source as a zip)
 * Run the "download\_assets\_git.py" script in the "makehuman" subdirectory of the source code.
 * Optionally also run:
@@ -42,12 +42,41 @@ If you rather run the code from source:
   * compile\_targets.py
 
 ### Installing python dependencies
+MakeHuman depends on the following Python packages:
+
+* numpy
+* PyQt5
+* PyOpenGL
+
+Additionaly MakeHuman's shell plugin can make use of [IPython / Jupyter](https://jupyter.org/). You might also want to install these packages:
+
+* jupyterlab
+* qtconsole
+
+#### Installing python core dependencies on Linux
+It is recommended to install the aforementioned packages via the package manager of the operating system.
+
+* __Debian / Ubuntu / Mint:__
+  
+  `apt install python3-opengl python3-pyqt5 python3-pyqt5.qtopengl python3-pyqt5.qtsvg`
+
+* __openSUSE:__
+
+  `zypper install python3-numpy python3-qt5 python3-opengl`
+
+An alternative way to install dependencies is using __pip__. However, it is best practice to set up an [virtual environment](https://docs.python.org/3/library/venv.html)
+and activate it before using Python's package manager on a Linux system.
+For convenience, you might want to run:
+
+  `pip install -r requirements.txt`
+
+#### Installing python core dependencies on Windows
 You should be able to start the command "pip" by opening a console prompt ("run" -> "cmd.exe") and writing "pip". If not, 
-figure out how to run "pip": https://pip.pypa.io/en/stable/ (it should have been installed automatically by python)
+figure out how to run [__pip__](https://pip.pypa.io/en/stable/) (it should have been installed by python automatically):
 
-Use "pip" to install dependencies. Running the following command will install all python dependencies:
+Use __pip__ to install dependencies. Running the following command will install all python dependencies:
 
-* pip install -r requirements.txt
+`pip install -r requirements.txt`
 
 ### Installing plugins
 
@@ -62,8 +91,10 @@ If you want to use community plugins like the asset downloader - download them,
 
 Having done this, you can now start MakeHuman by running the makehuman.py script. On a prompt run 
 
-* python makehuman.py (on windows)
-* python3 makehuman.py (on debian, ubuntu, mint...)
+* python makehuman.py (on Windows)
+* python3 makehuman.py (on Debian, Ubuntu, Mint...)
+
+Alternatively there is a shell script named _makehuman_ to start the application on Linux systems. 
 
 ## Branches
 
@@ -77,4 +108,3 @@ Read-only reference branches
 * bitbucket-default: This is the code as it looks in the "default" branch at bitbucket.
 
 In addition you may from time to time see feature branches (usually named \_feature...), which are removed after having been merged to the master branch. 
-