I use VM and ubuntu to do my homework. After I decompress my file and run it, I find some error. To fix the error, I need to find the stdio.h and modify it. However, I can't find the files "stdio.h". The terminal indicates /usr/include/stdio.h:781:12.....error. My problem is that the stdio.h seems to exist under include but I can't find it, but not that it doesn't exist.(or the error would indicate "can't find stdio.h"?) I have googled it and install build-essential again, but it still can't work.

Does anyone know how to fix it?