=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Fetching swarm-0.61.tar.gz
=> Total size: 395061 bytes
Certificate verification failed for /C=BM/O=QuoVadis Limited/CN=QuoVadis Global SSL ICA G2
34374371912:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/s3_clnt.c:1269:
fetch: http://www.cl.cam.ac.uk/~mwd24/phd/bin/swarm-0.61.tar.gz: Authentication error
fetch: Unable to fetch expected file swarm-0.61.tar.gz
swarm-0.61.tar.gz                                        0  B    0  Bps
=> Checksum SHA1 OK for swarm-0.61.tar.gz
=> Checksum RMD160 OK for swarm-0.61.tar.gz
=> Checksum SHA512 OK for swarm-0.61.tar.gz