Problem with sudo in a chroot

[Sylvain Archenault <sylvain.archenault@laposte.net>]

Hello,

I've got this error, when i run this command in a chroot environment :

sylvain@ticho:/$ sudo -H firefox
sudo: unable to lookup ticho via gethostbyname()


sylvain@ticho:/$ hostname
ticho


Thanks for your help