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This is how to add the command add-apt-repository on Debian installations:

Step 01: Open the terminal. Make sure you’re root.

Step 02: Change the current directory to /usr/local/sbin
(thanks Michael)

cd /usr/local/sbin

Step 03: Download the following shell script

wget http://betamaster.us/blog/wp-content/uploads/2011/11/add-apt-repository

Step 04: Make it executable

chmod o+x /usr/sbin/add-apt-repository

Step 05: Make sure root is the files owner

chown root:root /usr/sbin/add-apt-repository