Script to update 2.9.x ISO to use Linuxcnc Version 2.10 (master branch)

This script installs linuxcnc master branch (2.10) after you have installed the ISO on the downloads page.
This is still abit untested so it would be good if somebody  with some Linux experience and familarity with apt tests this.
You may want to move to version 2.10 to get the latest QtPlasmac for example as the version in 2.9.4 is no longer maintained.
Instructions:
1. Download  attached script
2. Delete the .txt.extension
3. Check permisssions are executible (Right click, Properties and check Permissions tab)
4. Run the script from the folder it is downloaded to: sudo ./master.sh

The script deletes and modifies some files in the /etc/apt folder and sub-folders.  It does make a copy of the /etc/apt folder into your home folder

I tried on one PC and it worked. On another PC it didn't. If it fails, open the file and run each line individually
after the apt upgrade is complete, running linuxcnc should show version 2.10 on startup in the console and the splash screen.

To update down the track

sudo apt update && sudo apt upgrade
should do the trick (and update Debian too)

Enjoy.

Oops, revised script attached

The files I deleted, I created via the Linuxcnc installer I wrote, hence the backup.
 

Thats what happens on the way out the door to work

Run these commands one by one
if the echo commnad does not work then 
and add the text in ""  manually at the end of the file