I know it’s not the answer you asked for, but I recently had some troubles compiling (and then running) ROOT on Ubuntu 14.04 and I solved deleting all /usr/share/root/* files and installing the packages from Ubuntu Software Center.
Please note that TSpectrum, Graphical Fit Panel and other components are provided via separate packages, often with the “plugin” keyword in the name.
If you don’t need to compile with some special configuration (–enable-something) this is probably the fastest solution…
PS: for the records, Ubuntu Desktop 14.04 is not (yet) the LTS version; that is scheduled to come out in June. When I move to that, I’ll report ROOT installation problems
I need to correct this as false: while my 14.04 upgrade was not recognized as “LTS”, when I was asked for more sources about this new “June release” I could find no one, even the one I remember to have read; instead, on official repositories there is only one 14.04 version marked as LTS. I apologize with all forumers.