How can we receive hashtx and hashblock from bitcoind by zmq subscribe?
The PPA you have installed (https://launchpad.net/~bitcoin/+archive/ubuntu/bitcoin/+packages) is not compiled with ZMQ support (It should in future).

You need to self-compile bitcoin v0.13.0 or use one of the "official" binaries: https://bitcoin.org/bin/bitcoin-core-0.13.0/

EDIT: since 0.14, ZMQ support is available via the PPA