apt-get will try to do translation for it’s output:
Ign http://security.ubuntu.com natty-security/multiverse Translation-en_US
Ign http://security.ubuntu.com natty-security/multiverse Translation-en
to avoide such translation indication, create a file in /etc/apt/apt.conf.d, say file name is 99translations, and put the following text line into the file:
Acquire::Languages “none”;