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Réduire le temps de démarrage

J'essaie de réduire mon temps de démarrage pour Ubuntu 16.04 LTS autant que possible. Quels sont les moyens possibles d'obtenir une liste des modules inutiles chargés au démarrage?

MODIFIER:
systemd-analyze blame sortie:

     3min 495ms powerd.service
     18.974s NetworkManager-wait-online.service
     15.514s ModemManager.service
     14.454s dev-sda2.device
     14.223s grub-common.service
     14.216s irqbalance.service
     14.203s cpufreqd.service
     14.184s apport.service
     13.644s networking.service
     13.259s accounts-daemon.service
     13.077s speech-dispatcher.service
     13.010s linuxlogo.service
     12.434s systemd-logind.service
     12.413s apmd.service
     12.392s sddm.service
     12.390s sysstat.service
     12.371s aksusbd.service
     12.366s ondemand.service
     12.365s rsyslog.service
     12.359s pppd-dns.service
     12.353s click-system-hooks.service
     12.352s gpu-manager.service
     12.343s lm-sensors.service
     12.341s systemd-user-sessions.service
     12.340s cgroupfs-mount.service
     12.333s alsa-restore.service
     12.319s bluetooth.service
     12.309s iio-sensor-proxy.service
     11.539s ufw.service
     11.380s avahi-daemon.service
     11.377s thermald.service
      5.141s apparmor.service
      4.257s qemu-kvm.service
      4.209s nmbd.service
      4.147s NetworkManager.service
      3.567s sensord.service
      3.313s quota.service
      2.981s systemd-udevd.service
      2.639s apt-daily.service
      2.254s systemd-tmpfiles-setup-dev.service
      2.235s keyboard-setup.service
      2.137s kannel.service
      1.775s lightdm.service
      1.643s dev-loop0.device
      1.621s console-setup.service
      1.517s dev-loop1.device
      1.466s dev-hugepages.mount
      1.463s dev-loop2.device
      1.405s systemd-fsck@dev-disk-by\x2duuid-14DD\x2d2000.service
      1.271s binfmt-support.service
      1.266s dev-mqueue.mount
      1.259s sys-kernel-debug.mount
      1.222s polkitd.service
      1.185s boot-efi.mount
      1.106s systemd-journald.service
      1.049s systemd-modules-load.service
      1.021s systemd-journal-flush.service
       713ms systemd-random-seed.service
       653ms ofono.service
       642ms snap-core-4327.mount
       630ms systemd-tmpfiles-setup.service
       620ms snap-core-4206.mount
       591ms snap-core-4110.mount
       558ms dns-clean.service
       554ms systemd-udev-trigger.service
       551ms proc-sys-fs-binfmt_misc.mount
       475ms ntp.service
       453ms resolvconf.service
       444ms [email protected]
       442ms dev-sda3.swap
       392ms systemd-update-utmp.service
       380ms systemd-backlight@backlight:intel_backlight.service
       350ms tlp.service
       346ms systemd-sysctl.service
       251ms ssh.service
       236ms setvtrgb.service
       216ms sys-kernel-config.mount
       214ms sys-fs-Fuse-connections.mount
       202ms docker.socket
       193ms kmod-static-nodes.service
       168ms smbd.service
       164ms wpa_supplicant.service
       151ms systemd-remount-fs.service
       149ms systemd-tmpfiles-clean.service
       120ms hddtemp.service
        32ms rc-local.service
        17ms plymouth-read-write.service
         7ms rtkit-daemon.service
         6ms postfix.service
         6ms systemd-update-utmp-runlevel.service
         5ms ureadahead-stop.service
         4ms ubuntu-fan.service
         3ms plymouth-quit-wait.service
         3ms vsftpd.service
bootdriverskerneltime
2
Prathu Baronia

Il y a quelques informations à ce sujet ici. https://bugs.launchpad.net/powerd/+bug/1443278 Sur cette page, ils disent comment désactiver le service avec

Sudo systemctl disable powerd.service
1
rkeating