Hi kwokmaster, gvolt
I installed the exact same setup today rpi3 (+ hifi amp2) and 7" official touchscreen with latest volumio and touchscreen plugin.
I only get a grey screen and mouse pointer.
I found out chromium-browser won’t install, tried several times un/installing the plugin without luck.
With some troubleshooting I found a workaround. Looking at install.sh file on github I did the following:
wget http://repo.volumio.org/Volumio2/Binaries/arm/libraspberrypi0_0.0.1_all.deb --no-check-certificate
wget http://repo.volumio.org/Volumio2/Binaries/arm/raspberrypi-bootloader_0.0.1_all.deb no-check-certificate
wget http://repo.volumio.org/Volumio2/Binaries/arm/raspberrypi-kernel_0.0.1_all.deb no-check-certificate
sudo dpkg -i libraspberrypi0_0.0.1_all.deb
sudo dpkg -i raspberrypi-bootloader_0.0.1_all.deb
sudo dpkg -i raspberrypi-kernel_0.0.1_all.deb
rm libraspberrypi0_0.0.1_all.deb
rm raspberrypi-bootloader_0.0.1_all.deb
rm raspberrypi-kernel_0.0.1_all.deb
sudo apt-get install -y chromium-browser
The --no-check-certificate flag did the trick because the repo certificate is not trusted/expired
Hope this can help others too.