app-misc/ca-certificates-20180409.3.37 attempts to download a tarball of certs which no longer exists on debian.org servers http://ftp.us.debian.org/debian/pool/main/c/ca-certificates/ca-certificates_20180409.tar.xz Also, this is the only version of his package not masked for ~amd64 Thanks
app-misc/ca-certificates-20180409.3.37 is no longer in portage.