Download LookingGlass to the intended folder within your web directory
Extract archive:
Option #1 - Extract archive to the current directory:
tar -zxvf LookingGlass-1.3.0.tar.gz --strip-components 1
Option #2 - Extract archive to a directory named LookingGlass:
tar -zxvf LookingGlass-1.3.0.tar.gz --transform 's!^[^/]\+\($\|/\)!LookingGlass\1!'
Navigate to the LookingGlass subdirectory in terminal
Run bash configure.sh
Follow the instructions and configure.sh will take care of the rest
Forgot a setting? Simply run the configure.sh script again