=> Bootstrap dependency digest>=20010302: found digest-20160304 => Fetching ettercap-NG-0.7.3.tar.gz => Total size: 1138643 bytes Certificate verification failed for /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3 34374371912:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/s3_clnt.c:1269: fetch: http://downloads.sourceforge.net/sourceforge/ettercap/ettercap-NG-0.7.3.tar.gz: Authentication error fetch: Unable to fetch expected file ettercap-NG-0.7.3.tar.gz ettercap-NG-0.7.3.tar.gz 0 B 0 Bps => Checksum SHA1 OK for ettercap-NG-0.7.3.tar.gz => Checksum RMD160 OK for ettercap-NG-0.7.3.tar.gz => Checksum SHA512 OK for ettercap-NG-0.7.3.tar.gz