diff --git a/INSTALL.md b/INSTALL.md
index 0ff56f10..81037c58 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -117,12 +117,23 @@ You will need:
  * OpenAL (OpenAL-Soft) >= 1.13
  * po4a >= 0.45 (to generate translated data files)
 
+On Ubuntu (and probably any other Debian-based system), you can use the following command to install all required packages:
+```
+  $ apt-get install build-essential cmake libsdl1.2debian libsdl1.2-dev libsdl-image1.2 libsdl-image1.2-dev libsdl-ttf2.0-0 libsdl-ttf2.0-dev libsdl-mixer1.2 libsdl-mixer1.2-dev libsndfile1-dev libvorbis-dev libogg-dev libpng12-dev libglew-dev libopenal-dev libboost-dev libboost-system-dev libboost-filesystem-dev libboost-regex-dev git
+```
+
 Make sure you install the packages along with header files (often distributed in separate *-dev packages). If you miss any requirements,
 CMake should warn you.
 
-To compile colobot, run your favorite shell and change the directory to where you downloaded colobot source files:
+To compile colobot, run your favorite shell and download colobot source files:
 ```
+  $ git clone https://github.com/colobot/colobot.git /path/to/colobot/sources
   $ cd /path/to/colobot/sources
+  $ git submodule update --init
+```
+If you want to compile development branch, change the first command to:
+```
+  $ git clone -b dev https://github.com/colobot/colobot.git /path/to/colobot/sources
 ```
 It is recommended that you create a build directory:
 ```
diff --git a/data b/data
index 8c148a8d..b4aee6e6 160000
--- a/data
+++ b/data
@@ -1 +1 @@
-Subproject commit 8c148a8d5dd57e3662b3422d7c50b55ce518b22e
+Subproject commit b4aee6e68407ba92dbd1b4985511b2b0f1c76854