Update install_dependencies.sh Ubuntu libgconf-2-4 (#6477)

According to https://packages.ubuntu.com/search?keywords=libgconf&searchon=names&suite=all&section=all
Ubuntu 19.04 and 19.10 do not have a package named libgconf2-4, only libgconf-2-4 (note the extra dash).
Ubuntu 16.04, 18.04 and 18.10 should accept both libgconf2-4 and libgconf-2-4 .

#changelog #linux

scripts/linux/ubuntu/install_dependencies.sh

@@ -187,7 +187,7 @@ else
     GLFW_PKG=
 fi
 
-PACKAGES="curl libjack-jackd2-0 libjack-jackd2-dev freeglut3-dev libasound2-dev libxmu-dev libxxf86vm-dev g++${CXX_VER} libgl1-mesa-dev${XTAG} libglu1-mesa-dev libraw1394-dev libudev-dev libdrm-dev libglew-dev libopenal-dev libsndfile-dev libfreeimage-dev libcairo2-dev libfreetype6-dev libssl-dev libpulse-dev libusb-1.0-0-dev libgtk${GTK_VERSION}-dev  libopencv-dev libassimp-dev librtaudio-dev libboost-filesystem${BOOST_VER}-dev libgstreamer${GSTREAMER_VERSION}-dev libgstreamer-plugins-base${GSTREAMER_VERSION}-dev  ${GSTREAMER_FFMPEG} gstreamer${GSTREAMER_VERSION}-pulseaudio gstreamer${GSTREAMER_VERSION}-x gstreamer${GSTREAMER_VERSION}-plugins-bad gstreamer${GSTREAMER_VERSION}-alsa gstreamer${GSTREAMER_VERSION}-plugins-base gstreamer${GSTREAMER_VERSION}-plugins-good gdb ${GLFW_PKG} liburiparser-dev libcurl4-openssl-dev libpugixml-dev libgconf2-4 libgtk2.0-0 libpoco-dev"
+PACKAGES="curl libjack-jackd2-0 libjack-jackd2-dev freeglut3-dev libasound2-dev libxmu-dev libxxf86vm-dev g++${CXX_VER} libgl1-mesa-dev${XTAG} libglu1-mesa-dev libraw1394-dev libudev-dev libdrm-dev libglew-dev libopenal-dev libsndfile-dev libfreeimage-dev libcairo2-dev libfreetype6-dev libssl-dev libpulse-dev libusb-1.0-0-dev libgtk${GTK_VERSION}-dev  libopencv-dev libassimp-dev librtaudio-dev libboost-filesystem${BOOST_VER}-dev libgstreamer${GSTREAMER_VERSION}-dev libgstreamer-plugins-base${GSTREAMER_VERSION}-dev  ${GSTREAMER_FFMPEG} gstreamer${GSTREAMER_VERSION}-pulseaudio gstreamer${GSTREAMER_VERSION}-x gstreamer${GSTREAMER_VERSION}-plugins-bad gstreamer${GSTREAMER_VERSION}-alsa gstreamer${GSTREAMER_VERSION}-plugins-base gstreamer${GSTREAMER_VERSION}-plugins-good gdb ${GLFW_PKG} liburiparser-dev libcurl4-openssl-dev libpugixml-dev libgconf-2-4 libgtk2.0-0 libpoco-dev"
 
 echo "installing OF dependencies"
 echo "OF needs to install the following packages using apt-get:"
@@ -234,4 +234,4 @@ else
 	echo "Updating ofxOpenCV to use openCV4"
 	sed -i -E 's/ADDON_PKG_CONFIG_LIBRARIES =(.*)opencv\s/ADDON_PKG_CONFIG_LIBRARIES =\1opencv4 /g' "$addons_dir/ofxOpenCv/addon_config.mk"
 	sed -i -E 's/ADDON_PKG_CONFIG_LIBRARIES =(.*)opencv$/ADDON_PKG_CONFIG_LIBRARIES =\1opencv4/g' "$addons_dir/ofxOpenCv/addon_config.mk"
-fi
+fi