Since upgrading from 14.10 to 15.04 a few days ago the boot time, grub OS screen to login screen, has increased from 12 seconds to about 40. This is my systemd-analyze critical-chain output:

The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

    graphical.target @37.433s
    └─multi-user.target @37.433s
      └─getty.target @37.432s
        └─[email protected] @37.432s
          └─systemd-user-sessions.service @35.906s +9ms
            └─remote-fs.target @35.904s
              └─media-XalnasStorage.mount @35.849s +53ms
                └─network-online.target @35.846s
                  └─network.target @11.636s
                    └─NetworkManager.service @11.502s +132ms
                      └─basic.target @11.487s
                        └─sockets.target @11.487s
                          └─avahi-daemon.socket @11.487s
                            └─sysinit.target @11.485s
                              └─networking.service @11.333s +65ms
                                └─apparmor.service @11.269s +63ms
                                  └─local-fs.target @11.268s
                                    └─media-TStore1.mount @10.331s +936ms
                                      └─local-fs-pre.target @10.328s
                                        └─systemd-remount-fs.service @10.320s +6ms
                                          └─systemd-fsck-root.service @10.303s +15ms
                                            └─systemd-journald.socket @151ms
                                              └─-.slice @150ms

There seems to be a problem with the network manager service.

The top of the systemd-analyze blame log looks like this:

     24.209s NetworkManager-wait-online.service
     10.056s systemd-udev-settle.service
      1.499s plymouth-quit-wait.service
       936ms media-TStore1.mount
       487ms dev-disk-by\x2duuid-920a92b0\x2d6e65\x2d4a7a\x2d855d\x2d81cb436cd85f.device
       425ms [email protected]
       421ms [email protected]
       407ms media-TStore2.mount
       267ms gpu-manager.service
       215ms plymouth-read-write.service
       209ms [email protected]
       132ms NetworkManager.service
        83ms ModemManager.service

The complete version can be seen here.

Also the systemd-analyze plot output can be seen here.

Thanks for your time.

  • Atleast mark the answer as best answer.
    – Suraj Jain
    Feb 12, 2017 at 11:20
  • What is the use of this service?
    – Sandeep C
    Mar 23, 2018 at 14:30
  • 2
    @SandeepC Wait for the network to goes online, in case networking is needed for booting (so not realy needed for most of the desktop users;) see askubuntu.com/questions/1018576/… Apr 1, 2018 at 12:23

3 Answers 3


I faced the same problem before, NetworkManager taking about 8 seconds. There are three ways to solve this problem:

  1. Disable connecting automatically for your connection

    edit connections > select your connection > edit and disable connecting automatically

    enter image description here

  2. You can simply disable Enable networking from network indicator.

  3. You can disable the service by running this command

    systemctl disable NetworkManager-wait-online.service
  • 1
    Third one worked for me too with no ill-effects (so far). Jul 29, 2017 at 17:41
  • Third one worked for me (18.04 upgraded from clean 17.10). Apr 29, 2018 at 20:38
  • #3 worked for me on 18.04.1, no issues after disabling.
    – Mad Man
    Sep 1, 2018 at 20:49

You can change the timeout of nm-online to something like 10:

Edit /lib/systemd/system/NetworkManager-wait-online.service as root or using sudo.

Look for the lines:

ExecStart=/usr/bin/nm-online -s -q --timeout=30

Change 30 to whatever you like. 10 worked well for me.

But beware this may break services that depend on it.


  • 4
    This answer greatly improved the boot time on my system. The top of the systemd-analyze blame output now looks like this: 9.861s systemd-udev-settle.service 6.920s NetworkManager-wait-online.service The boot time is still bigger than on the previous version of Ubuntu though. I edited your answer because mentioned file is in a different location in Ubuntu 15.04.
    – alx.balmus
    May 2, 2015 at 11:03
  • 2
    One side effect of decreasing the timeout value is that the network manager indicator shows up while the login screen is displayed or if you login very fast it shows after you have logged in. This happened in Ubuntu 14.10 and older. This is just a "cosmetic" side effect. I have not found any functional unwanted side effects.
    – alx.balmus
    May 2, 2015 at 11:13
  • 11
    You should use something like systemctl edit NetworkManager-wait-online.service or /etc/systemd/system/NetworkManager-wait-online.service.d/override.conf, otherwise the changes won't persist.
    – Tobu
    Jul 10, 2015 at 18:35
  • 2
    What is the use of this service?
    – Sandeep C
    Mar 23, 2018 at 14:30
  • Didn't work for me, Instead of that disabling the service with systemctl disable NetworkManager-wait-online.service worked well. Apr 29, 2018 at 20:42

Disable dhcp on eth0 interface.

If you have dhcp configured on eth0, and the wire is not connected, the system will keep looking for an ip address to assign your device, until the request for ip address times out, before the boot continues.

To verify if this would solve your problem, do sudo /etc/init.d/networking restart and take note of how long it takes for this service to restart.

The service will restart in no time, if there's no issues around eth0 interface, else, a long delay and timeout will be presented.

  • 1
    Why would that help?
    – guntbert
    Feb 20, 2016 at 22:18

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