所以我已经查看了这个网站上的很多建议，并尝试了很多建议，但它们都不同，我觉得这些是非常具体的问题，我缺乏专业知识来确定哪个案例适用于我。
这是我对 systemd-analyze 责备的结果
1min 59.160s plymouth-quit-wait.service
33.950s apt-daily.service
7.276s NetworkManager-wait-online.service
2.292s apt-daily-upgrade.service
754ms fwupd.service
397ms dev-sda6.device
375ms systemd-logind.service
362ms plymouth-start.service
230ms NetworkManager.service
209ms udisks2.service
169ms networkd-dispatcher.service
160ms systemd-timesyncd.service
147ms systemd-resolved.service
135ms ModemManager.service
123ms apparmor.service
104ms accounts-daemon.service
100ms keyboard-setup.service
99ms systemd-journal-flush.service
91ms systemd-udevd.service
75ms upower.service
71ms systemd-udev-trigger.service
69ms plymouth-read-write.service
62ms systemd-rfkill.service
这就是我从 systemd-analyze 关键链中得到的：
graphical.target @2min 330ms
??multi-user.target @2min 330ms
??kerneloops.service @8.446s +7ms
??network-online.target @8.441s
??NetworkManager-wait-online.service @1.164s +7.276s
??NetworkManager.service @932ms +230ms
??dbus.service @877ms
??basic.target @872ms
??sockets.target @872ms
??uuidd.socket @872ms
??sysinit.target …