diff --git a/.travis.yml b/.travis.yml
index 75160dfcd..5e01bb22c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,7 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System' ; fi
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then bash ./before_install_win_gitbash.sh ; fi
   
+
 before_script:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then ulimit -c unlimited -S ; fi
   
diff --git a/AUTHORS.txt b/AUTHORS.txt
index e5df95304..da5be2378 100644
--- a/AUTHORS.txt
+++ b/AUTHORS.txt
@@ -14,7 +14,7 @@ List of all matRad developers that contributed code (alphabetical)
 * Noa Homolka
 * Thomas Klinge
 * Henning Mescher
-* Lucas-Raphael Müller
+* Lucas-Raphael Müller
 * Ahmad Neishabouri
 * Giuseppe Pezzano
 * Carsten Scholz
diff --git a/before_install_linux.sh b/before_install_linux.sh
index 9b28f2a58..52b6a22cc 100644
--- a/before_install_linux.sh
+++ b/before_install_linux.sh
@@ -46,7 +46,7 @@ sudo make test
 sudo make install
 sudo ldconfig
 
-
+sudo apt-get install gnuplot-x11
 # clone repository with IpOpt Interface
 git clone https://github.com/ebertolazzi/mexIPOPT