Ubuntu 12.04 LTS Missing something?

I think I'm still missing something. Any idea what it is?
I installed go:
sudo apt-get install golang-go

then installed git:
sudo apt-get install git-core

I try the command:
sudo go get github.com/FiloSottile/Heartbleed
and get the following:
# github.com/davecgh/go-spew/spew

/usr/lib/go/src/pkg/github.com/davecgh/go-spew/spew/dump.go:211: vt.ConvertibleTo undefined (type reflect.Type has no field or method ConvertibleTo)
/usr/lib/go/src/pkg/github.com/davecgh/go-spew/spew/dump.go:217: vv.Convert undefined (type reflect.Value has no field or method Convert)
# github.com/FiloSottile/Heartbleed/tls

/usr/lib/go/src/pkg/github.com/FiloSottile/Heartbleed/tls/cipher_suites.go:66: undefined: cipher.AEAD
/usr/lib/go/src/pkg/github.com/FiloSottile/Heartbleed/tls/cipher_suites.go:133: undefined: cipher.AEAD
/usr/lib/go/src/pkg/github.com/FiloSottile/Heartbleed/tls/cipher_suites.go:149: undefined: cipher.AEAD
/usr/lib/go/src/pkg/github.com/FiloSottile/Heartbleed/tls/handshake_server.go:556: undefined: crypto.PublicKey
/usr/lib/go/src/pkg/github.com/FiloSottile/Heartbleed/tls/tls.go:93: undefined: net.Dialer