conio.h is a C header file used with old MS-DOS compilers to create text user interfaces. Compilers that target other operating systems, such as Linux-based, 32-bit Windows and OS/2, provide equivalent functionality through other header files and libraries.
The #include <curses.h> will give you almost all of the functionality provided by conio.h.
“ncurses” needs to be installed in the first place.
If you use the Apt package manager:
sudo apt-get install libncurses5-dev libncursesw5-dev
If you use rpm:
sudo yum install ncurses-devel ncurses
For getch, take a look at the “NCURSES Programming HOWTO” article.
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