为什么我装不了non-free里的软件?

summerboy

我的source.list

deb http://ftp.us.debian.org/debian testing main contrib non-free
deb-src http://ftp.us.debian.org/debian testing main contrib non-free

# Line commented out by installer because it failed to verify:
deb http://security.debian.org/ etch/updates main contrib
# Line commented out by installer because it failed to verify:
deb-src http://security.debian.org/ etch/updates main contrib