TaxCalc uses the QT framework which, in turn, requires the following system libraries to be present on your Linux operating system. If any are missing or not up to date, please see the instructions below on installing them yourself.

libpcre2-16-0 
– open source C library providing regular expression pattern matching 

libxcb-cursor0;

libxcb1 ;
libxcb-xinerama0 ;
libx11-6 ;
libxext6 ;
libxrandr2

– libraries that interfaces with the X11 display server and handle general UI and  multiple monitor support

libxkbcommon-x11-0 
– library providing keyboard interface support

You can install the above with the following terminal command:

sudo apt install libpcre2-16-0 libxcb-cursor0 libxcb1 libxcb-xinerama0 libxkbcommon-x11-0 libx11-6 libxext6 libxrandr2