Please help install "n4itk bias correction"

[tphankr]

I followed: (http://neuro.debian.net/install_pkg.html?p=ants) and I typed 2 comment line, as following

but I always have the erorr: Executing: /tmp/apt-key-gpghome.b4vHpGoTEi/gpg.1.sh --recv-keys --keyserver hkp://pool.sks-keyservers.net:80 0xA5D32F012649A5A9
gpg: keyserver receive failed: No name

I also tried orthers server.
Thank you.