Ubuntu 16.04 64 位从登录屏幕到桌面大约需要 20 秒，从 grub 到登录屏幕大约需要 20 秒，
告诉我哪些服务可以安全禁用，我不经常使用 virtualbox 和蓝牙，其他所有东西都用过，比如打印机、wifi 等。
输出systemd-analyze
Startup finished in 5.145s (kernel) + 14.138s (userspace) = 19.284s
和输出
systemd-analyze blame
5.837s accounts-daemon.service
5.444s dev-sda6.device
4.864s grub-common.service
4.105s lightdm.service
4.075s ModemManager.service
4.001s preload.service
3.844s apparmor.service
3.566s networking.service
3.468s apport.service
3.332s ondemand.service
3.272s rsyslog.service
3.269s systemd-logind.service
3.253s alsa-restore.service
3.241s gpu-manager.service
3.226s avahi-daemon.service
3.185s systemd-user-sessions.service
3.185s pppd-dns.service
2.508s NetworkManager.service
2.003s [email protected]
1.640s plymouth-quit-wait.service
1.245s colord.service
712ms systemd-update-utmp.service
687ms systemd-udevd.service
669ms udisks2.service
632ms polkitd.service
602ms brltty.service
572ms systemd-localed.service
567ms systemd-backlight@backlight:intel_backlight.service
543ms systemd-rfkill.service
527ms systemd-tmpfiles-setup-dev.service
519ms thermald.service
490ms systemd-tmpfiles-setup.service
464ms systemd-modules-load.service
454ms systemd-tmpfiles-clean.service
450ms systemd-timesyncd.service
428ms systemd-journald.service
371ms wpa_supplicant.service
340ms ufw.service
317ms systemd-random-seed.service
284ms console-setup.service
281ms plymouth-start.service
270ms dev-hugepages.mount
270ms sys-kernel-debug.mount
224ms systemd-udev-trigger.service
177ms dev-mqueue.mount
168ms plymouth-read-write.service
165ms upower.service
131ms dns-clean.service
103ms systemd-sysctl.service
102ms dev-disk-by\x2duuid-8bd6db03\x2da87b\x2d4614\x2d927a\x2dd5916f3
68ms systemd-hostnamed.service
49ms systemd-journal-flush.service
47ms kmod-static-nodes.service
47ms snapd.socket
32ms systemd-remount-fs.service
28ms rc-local.service
10ms resolvconf.service
10ms rtkit-daemon.service
9ms systemd-update-utmp-runlevel.service
6ms ureadahead-stop.service
4ms sys-fs-fuse-connections.mount lines 39-61/61 (END)
也：
systemd-analyze critical-chain
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 @14.124s
└─lightdm.service @10.018s +4.105s
└─systemd-user-sessions.service @6.731s +3.185s
└─basic.target @6.625s
└─sockets.target @6.625s
└─snapd.socket @6.576s +47ms
└─sysinit.target @6.574s
└─swap.target @6.574s
└─dev-disk-by\x2duuid-8bd6db03\x2da87b\x2d4614\x2d927a\x2dd5916f3c
└─dev-disk-by\x2duuid-8bd6db03\x2da87b\x2d4614\x2d927a\x2dd5916f
lines 1-13/13 (END)
我使用的是 7200 RPM 的 HDD，我认为启动时间还可以，但是在登录屏幕之后，我必须等待 20 秒才能看到空白屏幕，我已经禁用了一些启动项，例如 ORCA、BLUETOOTH、备份监视器、辅助功能等、个人文件共享和用户文件夹更新等，但仍然没有任何改善，如何诊断罪魁祸首并对其进行处理。
答案1
尝试删除一些未使用的依赖项和孤立包。这会有所帮助。
它对我的情况有效。运行：
sudo apt autoremove && sudo apt autoclean
另外，您可以安装吉特可芬（sudo apt-get install gtkorphan）删除其他应用程序留下的所有孤立包和依赖项。