我正在尝试尽可能减少 Ubuntu 16.04 LTS 的启动时间。有哪些方法可以获取启动时加载的不必要模块列表？
编辑：
systemd-analyze blame输出：
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
答案1
这里有一些有关此的信息。 https://bugs.launchpad.net/powerd/+bug/1443278 在该页面上，他们说了如何使用
sudo systemctl disable powerd.service