Erro no repositório do debina

Pessoal,

Tive um problema com o repositório do debian para fazer atualzações.

deb http://ftp.br.debian.org/debian stretch main contrib non-free
deb http://ftp.br.debian.org/debian stretch-updates main contrib non-free
deb http://security.debian.org/ stretch/updates main contrib non-free

Pra resolver, alterei o arquivo /etc/apt/source.list para o código abaixo:

#Official Debian Repos (US Mirrors) #
deb http://ftp.us.debian.org/debian/ stretch main contrib non-free
deb http://ftp.us.debian.org/debian/ stretch-updates main contrib non-free

# Debian Security Updates #
deb http://security.debian.org/ stretch/updates main contrib non-free

# Debian Backports #
deb http://ftp.debian.org/debian stretch-backports main