I install TestDisk 6.8 in Ubuntu linux and when I run it , it show :

"TestDisk 6.8, Data Recovery Utility, August 2007
Christophe GRENIER <[email protected]>
http://www.cgsecurity.org

TestDisk need 25 lines to work.
Please enlarge the terminal."

Terminal window is in maximom size and monitor resolution is 1366*768 (16:9).
How can I solve this problem ?