Replace mysql with mariadb as default.

install/hst-install-ubuntu.sh

@@ -555,10 +555,7 @@ rm -rf $HESTIA > /dev/null 2>&1
 #----------------------------------------------------------#
 
 # Excluding packages
-if [ "$release" != "15.04" ] && [ "$release" != "15.04" ]; then
-    software=$(echo "$software" | sed -e "s/apache2.2-common//")
-fi
-
+software=$(echo "$software" | sed -e "s/apache2.2-common//")
 if [ "$nginx" = 'no'  ]; then
     software=$(echo "$software" | sed -e "s/^nginx//")
 fi