Programming • GDB doesn't work

Code:

arto@dell:~$ aptitude search geany p   geany                              - fast and lightweight IDE                    v   geany-abi-18432                    -                                             v   geany-api-240                      -                                             p   geany-common                       - fast and lightweight IDE -- common files    p   geany-plugin-addons                - miscellaneous plugins for Geany             p   geany-plugin-autoclose             - auto-closing plugin for Geany               p   geany-plugin-automark              - auto-mark plugin for Geany                  p   geany-plugin-codenav               - code navigation plugin for Geany            p   geany-plugin-commander             - command panel plugin for Geany              p   geany-plugin-ctags                 - ctags plugin for Geany                      p   geany-plugin-debugger              - debugger plugin for Geany                   p   geany-plugin-defineformat          - on-the-fly #define prettyprinter plugin for p   geany-plugin-doc                   - documentation plugin for Geany              p   geany-plugin-extrasel              - extra selection plugin for Geany            p   geany-plugin-gendoc                - documentation generation plugin for Geany   p   geany-plugin-geniuspaste           - GeniusPaste plugin for Geany                p   geany-plugin-git-changebar         - git change bar plugin for Geany             p   geany-plugin-gproject              - transitional dummy package for geany-plugin-p   geany-plugin-insertnum             - number inserting plugin for Geany           p   geany-plugin-keyrecord             - git change bar plugin for Geany             p   geany-plugin-latex                 - improved LaTeX support plugin for Geany     p   geany-plugin-lineoperations        - Line Operations plugin for Geany            p   geany-plugin-lipsum                - Lorem Ipsum generator plugin for Geany      p   geany-plugin-lua                   - Lua scripting plugin for Geany              p   geany-plugin-macro                 - macro plugin for Geany                      p   geany-plugin-markdown              - markdown plugin for Geany                   p   geany-plugin-miniscript            - Geany Mini-Script filter plugin             p   geany-plugin-numberedbookmarks     - numbered bookmarks plugin for Geany         p   geany-plugin-overview              - overview plugin for Geany                   p   geany-plugin-pairtaghighlighter    - tag pair highlighter plugin for Geany       p   geany-plugin-pg                    - pg plugin for Geany                         p   geany-plugin-pohelper              - Geany plugin for improved support for GetTexp   geany-plugin-prettyprinter         - XML pretty printer for Geany                p   geany-plugin-prj                   - alternative project manager for Geany       p   geany-plugin-projectorganizer      - projectorganizer plugin for Geany           p   geany-plugin-scope                 - graphical GDB front-end for Geany           p   geany-plugin-sendmail              - mailer plugin for Geany                     p   geany-plugin-shiftcolumn           - text column shifting plugin for Geany       p   geany-plugin-spellcheck            - spellcheck plugin for Geany                 p   geany-plugin-tableconvert          - table convert plugin for Geany              p   geany-plugin-treebrowser           - tree browser plugin for Geany               p   geany-plugin-updatechecker         - update checker plugin for Geany             p   geany-plugin-vc                    - VCS plugin for Geany                        p   geany-plugin-vimode                - Vim-mode plugin for Geany                   p   geany-plugin-workbench             - workbench plugin for Geany                  p   geany-plugin-xmlsnippets           - XMLSnippets plugin for Geany                p   geany-plugins                      - Kokoelma liitännäisiä Geanylle              p   geany-plugins-common               - set of plugins for Geany (translations)     arto@dell:~$