Ubuntu 19.04 systemd-analyze blame returns Bootup not finished

I am using a Dell Laptop with Ubuntu Budgie 19.04.

Whenever I run the command :

systemd-analyze blame  

it returns :

Bootup is not yet finished org.freedesktop.systemd1.Manager.FinishTimestampMonotonic=0). Please try again later. 

This, even if the computer booted hours ago and is working normally. Obviously, the boot process should have long terminated. Does this make sense to anyone? Is this the sign of any boot or load problem?

The command :

systemctl list-jobs  

returns :

 JOB UNIT                                 TYPE  STATE     2 multi-user.target                    start waiting 142 systemd-update-utmp-runlevel.service start waiting  35 setvtrgb.service                     start waiting 155 plymouth-quit-wait.service           start running 151 getty@tty1.service                   start waiting   1 graphical.target                     start waiting 149 getty.target                         start waiting 152 system-getty.slice                   start waiting 

Startup time from systemd-analyze blame does not add up

When you add up the values, it’s way more than 51 seconds.?

(Partial list of services.)

Startup finished in 6.983s (kernel) + 44.191s (userspace) = 51.174s graphical.target reached after 42.255s in userspace andy@7_~/Downloads$   systemd-analyze blame          21.614s systemd-journal-flush.service          21.044s dev-sda1.device          18.941s ufw.service          18.410s configure-printer@usb-002-003.service          16.334s keyboard-setup.service          11.486s NetworkManager-wait-online.service          11.362s configure-printer@usb-002-004.service          10.167s systemd-tmpfiles-setup-dev.service          10.101s systemd-sysctl.service