If you are a Poker Player, Linux has a game for you called ‘kpoker’. It’s designed for KDE but you still can play it on GNOME.
From Ubuntu Terminal screen (Applications > Accessories > Terminal), type:
taufanlubis@toshiba:~$ sudo apt-get install kpoker
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following NEW packages will be installed:
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 168kB of archives.
After unpacking 504kB of additional disk space will be used.