Drush problem in Ubuntu (unknown terminal "xterm-256color")

Hello,

I installed drush on my server (Drupal 7.8-1 on Ubuntu Linux 10.04 LTS 64bits) and I get an error:

tput: unknown terminal "xterm-256color" Drush command terminated abnormally due to an unrecoverable error.

Can anyone help me?

BR, Pasi