我在戴尔 Vostro 2520 笔记本电脑（i3 - 第三代）中运行 Ubuntu 20.04，内存为 4 GB（与 Windows 10 双启动）。Ubuntu 的启动占用了我相当多的时间，因此我正在寻找可以提供帮助的人。另外，我正在尝试了解这个过程，所以一点解释也会有所帮助。输出是systemd-analyze critical-chain：
graphical.target @1min 24.160s └─multi-user.target @1min 24.160s └─apache-htcacheclean.service @48.581s +95ms └─apache2.service @32.585s +15.972s └─network.target @32.581s └─NetworkManager.service @20.327s +12.253s └─dbus.service @20.320s └─basic.target @20.192soot └─sockets.target @20.192s └─snapd.socket @20.189s +2ms └─sysinit.target @20.040s └─swap.target @20.040s └─dev-disk-by\x2duuid-8eb9d29f\x2d3720\x2d4f9b\x2d99ad\x2dcbfc7fb65561.swap @19.949s +91ms └─dev-disk-by\x2duuid-8eb9d29f\x2d3720\x2d4f9b\x2d99ad\x2dcbfc7fb65561.device @19.948s
第一个屏幕的输出systemd-analyse blame是：
49.196s plymouth-quit-wait.service 17.305s networkd-dispatcher.service 16.183s accounts-daemon.service 15.972s apache2.service 14.888s dev-sda1.device 12.308s avahi-daemon.service 12.253s NetworkManager.service 11.889s polkit.service 11.612s udisks2.service 9.597s snapd.service 8.841s dev-loop3.device 8.688s apport.service 8.643s grub-common.service 8.582s ModemManager.service 8.479s dev-loop0.device 8.269s dev-loop2.device 8.231s dev-loop1.device 7.969s teamviewerd.service 7.838s preload.service 7.580s grub-initrd-fallback.service 7.393s rc.local.service 7.292s atd.service 7.227s e2scrub_reap.service 7.226s ftsprhv.service 7.224s gpu-manager.service 7.144s rsyslog.service 6.813s lm-sensors.service 6.530s pppd-dns.service 5.457s systemd-udevd.service 5.366s switcheroo-control.service 5.040s thermald.service 5.038s systemd-logind.service 5.029s wpa_supplicant.service 4.356s bluetooth.service 4.165s apparmor.service 3.958s systemd-journal-flush.service 3.633s systemd-resolved.service
我尝试了一些其他现有的解决方案，并已成功将其显著降低，但我相信还有进一步改进的空间。