Just to inform you:
Linux electroneumd does not work, it keeps flooding the log with unsucessfull connections to 0.0.0.0 and warning about
[P2P2] WARN net.dns src/common/dns_utils.cpp:487 WARNING: no two valid ElectroneumPulse DNS checkpoint records were received
Followed by plenty of:
017-11-01 02:00:07.158 [P2P0] INFO net.p2p src/p2p/connection_basic.cpp:164 Spawned connection p2p#11 to 0.0.0.0 currently we have sockets count:8
2017-11-01 02:00:07.158 [P2P0] INFO net contrib/epee/include/net/abstract_tcp_server2.inl:85 test, connection constructor set m_connection_type=2
2017-11-01 02:00:07.158 [P2P0] DEBUG net contrib/epee/include/net/abstract_tcp_server2.inl:962 connections_ size now 7
2017-11-01 02:00:11.155 [P2P2] INFO net.p2p src/p2p/connection_basic.cpp:172 Destructing connection p2p#5 to 0.0.0.0
2017-11-01 02:00:12.158 [P2P0] INFO net.p2p src/p2p/net_node.inl:969 [0.0.0.0:0 OUT] Connect failed to 52.48.6.23:26967
2017-11-01 02:00:12.158 [P2P0] DEBUG net.p2p src/p2p/net_node.inl:953 Connecting to 52.54.144.107:26967(peer_type=1, last_seen: never)...
2017-11-01 02:00:12.158 [P2P0] INFO net.p2p src/p2p/connection_basic.cpp:164 Spawned connection p2p#12 to 0.0.0.0 currently we have sockets count:8
2017-11-01 02:00:12.158 [P2P0] INFO net contrib/epee/include/net/abstract_tcp_server2.inl:85 test, connection constructor set m_connection_type=2
2017-11-01 02:00:12.158 [P2P0] DEBUG net contrib/epee/include/net/abstract_tcp_server2.inl:962 connections_ size now 7
2017-11-01 02:00:16.155 [P2P5] INFO net.p2p src/p2p/connection_basic.cpp:172 Destructing connection p2p#6 to 0.0.0.0
It does not download the blockchain, even not running suid root
Compiled it myself from the src for Ubuntu 16.04, now it works. So your Linux download version won´t definitely run with Ubuntu 16.04