14.04: could not get http://download.rethinkdb.com/apt/dists/trusty/main/binary-i386/Packages gnutls_handshake () failed: the link protocol failed in ubuntu 14

Nothing can be installed using the apt-get install command in Ubuntu 14.04.Gettting error:

Err http://download.rethinkdb.com trusty/main amd64 Packages                   

Err http://download.rethinkdb.com trusty/main i386 Packages                    

Err http://download.rethinkdb.com trusty/main amd64 Packages                   

Err http://download.rethinkdb.com trusty/main i386 Packages                    

Ign http://download.rethinkdb.com trusty/main Translation-en_IN                
Ign http://download.rethinkdb.com trusty/main Translation-en                   
Err http://download.rethinkdb.com trusty/main amd64 Packages                   
gnutls_handshake() failed: Handshake failed
Err http://download.rethinkdb.com trusty/main i386 Packages                    
gnutls_handshake() failed: Handshake failed
W: Failed to fetch 
http://download.rethinkdb.com/apt/dists/trusty/main/binary- 
amd64/Packages  gnutls_handshake() failed: Handshake failed

W: Failed to fetch 
http://download.rethinkdb.com/apt/dists/trusty/main/binary- 
i386/Packages  gnutls_handshake() failed: Handshake failed

E: Some index files failed to download. They have been ignored, or old 
ones used instead.