Hi @Danilo, I think this is a ‘bug’ in the ROOT web documentation.
See Update Ubuntu/Debian optional packages install command by pitkajuh · Pull Request #988 · root-project/web · GitHub
It should be added to the required dependencies. See also Built-in libraries of 6.30.06 - #4 by Wile_E_Coyote
@claytoniousfunk just do: sudo apt install libtbb-dev