I’ve successfully added this screen for my other pis, but with OSMC I get
sudo: rpi-update: command not found.
I’ve ran both sudo apt-get update and upgrade.
I cannot skip this step unfortunately it seems. Later in the instructions I’m supposed to edit /usr/share/X11/xorg.conf.d/99-fbturbo.conf, but it doesn’t exist. I assumed it was because I haven’t run rpi-update yet. I’ve tried skipping these steps but the screen doesn’t output.
You are going to have several issues here. First,OSMC blocks rpi-update so that we have some control of the firmware. This is so that new firmwares are only installed after the team has been able to ensure that function and performance are not negatively effected for our users.
Second, OSMC does not use X11 and you are going to have complications if you try to install it and make it work.
I’m not sure what instructions you are trying to follow but, they are not for installation on OSMC specifically. It is unfortunate but installing a touchscreen on an Rpi that uses a Kodi-centric distro like OSMC or Openelec is no simple matter. In all honesty, it likely hasn’t even been done enough times for any good tutorials to be written for accomplishing it. Here’s a Kodi thread that may give you a bit more understanding and includes a few links… http://forum.kodi.tv/showthread.php?tid=232221