Slow Boot Time

[txm0523]

Greetings everyone,
I too am experiencing very slow boot up times.From a previous post about this, I entered systemd-analyze blame and here is the output:
1min 5.921s vboxadd.service
    1min 3.906s plymouth-quit-wait.service
        35.413s keyboard-setup.service
        34.980s dev-sda5.device
        34.756s ufw.service
        33.792s systemd-journal-flush.service
        30.203s NetworkManager-wait-online.service
        11.342s lvm2-monitor.service
        10.889s systemd-tmpfiles-setup-dev.service
          8.384s systemd-udevd.service
          4.632s ModemManager.service
          4.074s NetworkManager.service
          3.972s networking.service
          3.939s accounts-daemon.service
          3.459s udisks2.service
          3.227s lightdm.service
          2.778s resolvconf-pull-resolved.service
          2.665s nmbd.service
          2.511s polkit.service
          2.171s rsyslog.service
          2.165s networkd-dispatcher.service
          1.906s smbd.service
          1.535s colord.service

Does anyone know what I can do to speed up boot time based on this output ?
Thanks,
txm0523