How to synchronize two PC?

edit

I have followed this instruction here : LINK to install chony and edit the conf file and on my Ubuntu PC I have included this line to syncrhonize with my embedded computer (where ros is running):

 server 192.168.86.26 minpoll 0 maxpoll 5 maxdelay .00

But when I type:

ntpdate -q 192.168.86.26

I get this:

15 Jan 01:24:48 ntpdate[4560]: 192.168.86.26 rate limit response from server.
server 192.168.86.26, stratum 2, offset -0.001573, delay 0.03282
15 Jan 01:24:48 ntpdate[4560]: adjust time server 192.168.86.26 offset -0.001573 sec

Why it isn't syncronized?

This is my /etc/chrony/chrony.conf file

pool ntp.ubuntu.com        iburst maxsources 4
pool 0.ubuntu.pool.ntp.org iburst maxsources 1
pool 1.ubuntu.pool.ntp.org iburst maxsources 1
pool 2.ubuntu.pool.ntp.org iburst maxsources 2

# This directive specify the location of the file containing ID/key pairs for
# NTP authentication.
keyfile /etc/chrony/chrony.keys

# This directive specify the file into which chronyd will store the rate
# information.
driftfile /var/lib/chrony/chrony.drift

# Uncomment the following line to turn logging on.
#log tracking measurements statistics

# Log files location.
logdir /var/log/chrony

# Stop bad estimates upsetting machine clock.
maxupdateskew 100.0

# This directive enables kernel synchronisation (every 11 minutes) of the
# real-time clock. Note that it can’t be used along with the 'rtcfile' directive.
rtcsync

# Step the system clock instead of slewing it if the adjustment is larger than
# one second, but only in the first three clock updates.
makestep 1 3

server 192.168.86.26 minpoll 0 maxpoll 5 maxdelay .00