diff --git a/backend/scripts/install-java.sh b/backend/scripts/install-java.sh
index 6bf4edc8..f1edb02d 100755
--- a/backend/scripts/install-java.sh
+++ b/backend/scripts/install-java.sh
@@ -4,9 +4,8 @@
 touch /tmp/install-java.lock
 
 # install java
-apt-get clean
 apt-get update 
-apt-get install -y default-jdk
+apt-get install -y -f default-jdk
 ln -s /usr/bin/java /usr/local/bin/java
 
 # unlock