Cannot sync with the NTP server - ntp

Question

I am using lubuntu Linux 18.04 Bionic. When I print ntpq -pn I cannot see that my computer is synced with my desired NTP server.
I have tried several tutorials like here: LINK. I took the NTP servers from Google HERE and included the all 4 servers to my config file.
Then, I did the following things in order to sync with one of the Google NTP servers:
sudo service stop
sudo service ntpdate time1.google.com and received a log ntpdate[2671]: adjust time server 216.239.35.0 offset -0.000330 sec
sudo service start
Here is my /etc/ntp.conf file:
driftfile /var/lib/ntp/ntp.drift
leapfile /usr/share/zoneinfo/leap-seconds.list
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
restrict 127.0.0.1
restrict ::1
restrict source notrap nomodify noquery
server time1.google.com iburst
server time2.google.com iburst
server time3.google.com iburst
server time4.google.com iburst
After doing the steps above, I got this result from ntpq -pn:
remote refid st t when poll reach delay offset jitter
+216.239.35.0 .GOOG. 1 u 33 64 1 36.992 0.519 0.550
+216.239.35.4 .GOOG. 1 u 32 64 1 20.692 0.688 0.612
*216.239.35.8 .GOOG. 1 u 36 64 1 22.233 0.088 1.091
-216.239.35.12 .GOOG. 1 u 32 64 1 33.480 -0.218 1.378
Why my computer is not synced?
EDIT:
Here is my log output after sudo systemctl status ntp.service:
ntp.service - Network Time Service
Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2019-01-17 11:37:33 CET; 17min ago
Docs: man:ntpd(8)
Process: 2704 ExecStart=/usr/lib/ntp/ntp-systemd-wrapper (code=exited, status=0/SUCCESS)
Main PID: 2712 (ntpd)
CGroup: /system.slice/ntp.service
└─2712 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 105:108
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: proto: precision = 1.750 usec (-19)
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: leapsecond file ('/usr/share/zoneinfo/leap-seconds.list'): good hash
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: leapsecond file ('/usr/share/zoneinfo/leap-seconds.list'): loaded, e
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen and drop on 0 v6wildcard [::]:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen and drop on 1 v4wildcard 0.0.0.0:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen normally on 2 lo 127.0.0.1:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen normally on 3 wlan0 192.168.86.26:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen normally on 4 lo [::1]:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listen normally on 5 wlan0 [fe80::71d6:ec6e:fa92:b53%4]:123
Jan 17 11:37:33 ELAR-Systems ntpd[2712]: Listening on routing socket on fd #22 for interface updates

Answer 1

Your system time actually is getting synced but is running off very quick.
The Raspberry Pi, Arduino, Asus Tinker and the other PCB single-board computers have no onboard RTC (real time clock) and no battery to keep it up constantly. It has nothing to do with RAM or current, but simply the fact that there is no hardware clock on the computer.
On my raspberry pi, the time went off several minutes within an hour.
The "software clock" on the computer is impacted by system load and is very unstable.
An RTC extension (for RPI) looks like this:
(Source: www.robotshop.com)