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Re-branding Debian into Sparky made conflicts with the package.
https://wiki.debian.org/SourcesListsudo nano sudo nano /etc/apt/sources.list or sudo vim /etc/apt/sources.list or sudo geany .or you can nest it inside the directory sources.list.d via any of your favourite editors. There is lots of examples on the web. p.s. don't make a FrankenDebian If it is a Ubuntu ppa ... And about the terminal - tlp mentions that "TLP is a pure command line tool with automated background tasks, it does not contain a GUI."