What worked for me : RPi 2 : Ubuntu Mate : NTP issues

So I started with Rpi 2 and installed Ubuntu Mate. All worked well during the installation. But then I noticed. The time did not sync. Set at Nov 21 2015 when that particular build was created.  I started my search at google and there were few instances reported for time sync issue.

Below is what worked for me

For me ntpdate was not found. So I installed ntp
sudo service ntp reload

Next I tried to update time using following command
date ; sudo service ntp stop ; sudo ntpdate -s time.nist.gov ; sudo service ntp start ; date

Tried to reset timezone dpkg-reconfigure tzdata

Another issue is to check if the firewall was blocking outbound connection for port 123. Using commands one may get “ntpdate[14593]: no server suitable for synchronization found”
sudo ntpdate ntp.ubuntu.com
sudo ntpdate-debian

Modified the config file at /etc/ntp.conf as following

Added few servers
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
server time.nst.gov

Added below line at top tinker panic 0

And in the end ran command ntpdate -d servername or ntpdate -u servername

The two ntpdate commands above send, and expect UDP responses, on a random public port number, not port 123, on your computer so they avoid potential complications from using that privileged port inbound. Of course outbound filters could still be a problem.

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