NSClientSH is a Bash script to get values such as blood sugar from a NightScout instance.
NSClientSH requires jq for parsing json Data: https://stedolan.github.io/jq/ jq is directly available in most Linux distributions, e.g.: sudo apt-get install jq
The BG graph requires a Conky with integrated Lua support and the Cairo module for drawing. If "Cairo" is listed below "Lua bindings" in the output of "conky -v", it will work. Refer to the documentation of your Linux distributionn on how to install this module. For Ubuntu install either the conky-cairo or the conky-all package.