[xubuntu] I can't coect to ubuntu repositories

Hey guys
I can't coect my xubuntu to repositories to update it

when i put the this command line, it retus in a message and stucks:
# apt-get update
0% [Conectando em us.archive.ubuntu.com (2001:67c:1562::14)] [Conectando em archive.canonical.com (2001:67c:1360:8c01::1b)]

can anyone help me?
there is a problem with ubuntu repositories?

i use only canonical official and partners on my sources list, there is no PPA on my sources

(sorry for my poor english, i'm brazilian)