从我使用 systemd-analyze plot > plot.html 创建的 plot.html 中，我得到了以下内容：
Startup finished in 1min 32.747s (kernel) + 18.861s (userspace) = 1min 51.609s
Ubuntu 16.04 LTS MyName (Linux 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016) x86-64
从 systemd-blame 中，我得到了这个：
$ systemd-analyze blame
17.159s systemd-tmpfiles-setup.service
7.933s apparmor.service
6.241s dev-sda5.device
2.770s snapd.refresh.service
2.291s thermald.service
1.953s NetworkManager.service
1.348s ModemManager.service
1.330s accounts-daemon.service
1.122s grub-common.service
919ms lightdm.service
894ms systemd-udevd.service
809ms systemd-tmpfiles-setup-dev.service
677ms systemd-sysctl.service
648ms udisks2.service
596ms plymouth-start.service
519ms systemd-journald.service
476ms apport.service
415ms systemd-localed.service
395ms gpu-manager.service
380ms dns-clean.service
360ms ufw.service
360ms dev-hugepages.mount
359ms dev-mqueue.mount
359ms sys-kernel-debug.mount
359ms kmod-static-nodes.service
326ms irqbalance.service
317ms systemd-modules-load.service
310ms dev-disk-by\x2duuid-0b7bc590\x2dc768\x2d4bf3\x2d85ba\x2d1a3d7c5
310ms systemd-logind.service
301ms ondemand.service
288ms console-setup.service
286ms speech-dispatcher.service
284ms alsa-restore.service
274ms systemd-user-sessions.service
273ms systemd-udev-trigger.service
266ms pppd-dns.service
266ms rsyslog.service
261ms systemd-journal-flush.service
256ms avahi-daemon.service
256ms systemd-random-seed.service
224ms resolvconf.service
205ms networking.service
147ms polkitd.service
142ms upower.service
121ms systemd-tmpfiles-clean.service
92ms colord.service
87ms plymouth-read-write.service
50ms systemd-remount-fs.service
45ms systemd-hostnamed.service
42ms systemd-update-utmp.service
25ms [email protected]
9ms systemd-timesyncd.service
4ms systemd-update-utmp-runlevel.service
3ms ureadahead-stop.service
3ms rtkit-daemon.service
1ms sys-fs-fuse-connections.mount
1ms plymouth-quit-wait.service
772us rc-local.service
280us snapd.socket
请帮我找到解决方案，到底发生了什么？