I think apt-get install --reinstall gnuchess
home/user # apt-get install --reinstall gnuchess Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: xboard eboard Recommended packages: gnuchess-book The following NEW packages will be installed: gnuchess 0 upgraded, 1 newly installed, 0 to remove and 6 not upgraded. Need to get 110kB of archives. After this operation, 295kB of additional disk space will be used. WARNING: The following packages cannot be authenticated! gnuchess Install these packages without verification [y/N]? y Get:1 https://downloads.maemo.nokia.com ./ gnuchess 5.07-9osso1 [110kB] Fetched 110kB in 3s (28.9kB/s) Selecting previously deselected package gnuchess. (Reading database ... 30825 files and directories currently installed.) Unpacking gnuchess (from .../gnuchess_5.07-9osso1_armel.deb) ... Setting up gnuchess (5.07-9osso1) ... /home/user #