kubuntu boot time

I upgraded kubuntu version 14.10 to 15.10, and it works fine except that I noticed the startup is slow. googleing the problem, I found this
systemd-analyze blame
and it seems that
is the problem. So I googled how to disable it, and found
systemctl disable NetworkManager-wait-online.service
and that didn't work, then I found
systemctl mask NetworkManager-wait-online.service
but that didn't work either
So, any ideas how I could disable this service?
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All thing systemctl does is removes couple of files:
rm -i /etc/systemd/system/*wants/NetworkManager-wait-online.service
JeffBeallAuthor Commented:
Thank you!!! that FINALLY did it. Although, I had to find it at the location you had, but it still loaded on a reboot. Your answer made me search everywhere, and I found it two other places.
systemd-analyze blame
shows that it is finally gone.
Of course, now I want to weed out other services that I don't need, for instance the slowest service now is dev-sda6.device and then gpu-manager.service loading at 643ms and 582ms respectively.
the thing is, I don't know what I need and what I don't. Would there be a list of essential services?
Also, do you know of a way to just disable the service? It seems like an all or nothing kind of thing to remove the file.
(compare if something goes much slower than this and look into them)

          8.029s ModemManager.service
          8.021s systemd-udev-settle.service
          7.885s systemd-logind.service
          7.815s alsa-restore.service
          7.813s rsyslog.service
          7.807s atieventsd.service
          7.806s systemd-user-sessions.service
          7.802s rc-local.service
          7.801s vboxdrv.service
          7.767s bluetooth.service
          7.760s avahi-daemon.service
          7.754s wpa_supplicant.service
          3.054s lvm2-activation-early.service
          2.707s lvm2-activation.service
          2.503s systemd-fsck@dev-system-home.service
          2.378s fglrxrebuild.service
          1.690s NetworkManager-wait-online.service
          1.390s home.mount
          1.313s display-manager.service
          1.296s postgresql.service
          1.115s apparmor.service

(and I would like to thank you for inspiring me to chop my boot time by 10s)

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JeffBeallAuthor Commented:
I guess we both benefited, good collaboration, however, I think you would be the brains of this organization.
Yep, I have some googleing to do. I want to see just how fast this thing will boot.
Thanks again for your help.
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