parece que o ntpdate é depreciado tente:
sudo service ntp stop
sudo ntpd -gq
sudo service ntp start
OUTPUT:
{~}:$ sudo service ntp stop
{~}:$ sudo ntpd -gq
1 Jun 08:55:37 ntpd[9331]: ntpd [email protected] Fri Apr 8 20:58:07 UTC 2016 (1): Starting
1 Jun 08:55:37 ntpd[9331]: Command line: ntpd -gq
1 Jun 08:55:37 ntpd[9331]: proto: precision = 0.124 usec (-23)
1 Jun 08:55:37 ntpd[9331]: Listen and drop on 0 v6wildcard [::]:123
1 Jun 08:55:37 ntpd[9331]: Listen and drop on 1 v4wildcard 0.0.0.0:123
1 Jun 08:55:37 ntpd[9331]: Listen normally on 2 lo 127.0.0.1:123
1 Jun 08:55:37 ntpd[9331]: Listen normally on 3 eth0 192.168.1.20:123
1 Jun 08:55:37 ntpd[9331]: Listen normally on 4 lo [::1]:123
1 Jun 08:55:37 ntpd[9331]: Listen normally on 5 eth0 []:123
1 Jun 08:55:37 ntpd[9331]: Listening on routing socket on fd #22 for interface updates
1 Jun 08:55:38 ntpd[9331]: Soliciting pool server 184.105.192.247
1 Jun 08:55:39 ntpd[9331]: Soliciting pool server 107.170.242.27
1 Jun 08:55:39 ntpd[9331]: Soliciting pool server 204.9.54.119
1 Jun 08:55:40 ntpd[9331]: Soliciting pool server 104.156.99.226
1 Jun 08:55:40 ntpd[9331]: Soliciting pool server 50.116.52.97
1 Jun 08:55:40 ntpd[9331]: Soliciting pool server 129.250.35.251
1 Jun 08:55:41 ntpd[9331]: Soliciting pool server 67.18.187.111
1 Jun 08:55:41 ntpd[9331]: Soliciting pool server 45.79.10.228
1 Jun 08:55:41 ntpd[9331]: Soliciting pool server 209.114.111.1
1 Jun 08:55:41 ntpd[9331]: ntpd: time slew -0.001862 s
ntpd: time slew -0.001862s
{~}:$
Veja se isso fará o que você precisa. Também .. .ntpdate não poderá se conectar se o serviço estiver rodando .. então você pode usar
sudo service ntp stop
sudo ntpdate -s us.pool.ntp.org
sudo service ntp start
OUTPUT:
{~}:$ sudo service ntp stop
{~}:$ sudo ntpdate -s us.pool.ntp.org
{~}:$
Mas eu tentei isso e não consegui nenhuma saída como fiz com o comando ntpd -gq
.