iostream file not found after upgrading ubuntu from 18.04 to 20.04

Hi, I recently did a software upgrade from Ubuntu 18.04 to 20.04. Once that's completed, now the IDE is not recognizing the standard libraries like 'iostream'. I doubt either those packages need to be reinstalled or the path to those libraries might have changed. I would like to know if anyone has faced a similar issue before and I await any suggestions to solve the problem.

Thanks