Install gdb-doc by entering the following commands in the terminal:
sudo apt update sudo apt install gdb-doc
Description:
The GNU Debugger Documentation
GDB is a source-level debugger, capable of breaking programs at any specific line, displaying variable values, and determining where errors occurred. Currently, it works for C, C++, Fortran, Modula 2 and Java programs. A must-have for any serious programmer. . This package contains the GDB manual.
Homepage: http://www.gnu.org/s/gdb/
Version: 8.1-0ubuntu3
Section: devel