Synchronize date and time

timedatectl

#check state and settings
timedatectl

#turn sync on, it could take some minutes to sync
sudo timedatectl set-ntp true

Problem on 14.04

Source:

• https://help.ubuntu.com/lts/serverguide/NTP.html

An Ubuntu upgrade keeps the ntpdate configuration intact and timedatectl is turned on but not synchronizing. Since ntpdate is depreciated you can manually uninstall it and replace it with ntp.

#uninstall ntpdate
sudo apt-get autoremove ntpdate

#install ntp daemon (ntpd)
sudo apt install ntp

#restart service, force update
sudo service ntp stop

#correct the time regardless of the offset (g) and exit immediately (q)
sudo ntpd -gq

#start the service
sudo service ntp start

#check state and settings
timedatectl

See also

• https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-ubuntu-16-04

ntpdate (depreciated)

Source:

• https://askubuntu.com/questions/228/how-to-set-ubuntu-to-synchronize-my-clock-with-a-time-server

sudo ntpdate pool.ntp.org