Ubuntu 版本：20.04
磁盘类型：硬盘
Startup finished in 5.137s (firmware) + 3.525s (loader) + 4.109s (kernel) + 1min 13.665s (userspace) = 1min 26.438s
graphical.target reached after 1min 12.518s in userspace
42.842s plymouth-quit-wait.service >
22.628s NetworkManager-wait-online.service >
21.565s udisks2.service >
18.962s snapd.service >
18.125s [email protected] >
18.018s [email protected] >
15.183s systemd-journal-flush.service >
11.914s networkd-dispatcher.service >
11.435s [email protected] >
10.914s dev-sda1.device >
9.903s accounts-daemon.service >
8.082s apport-autoreport.service >
7.637s teamviewerd.service >
7.254s polkit.service >
6.908s NetworkManager.service >
6.889s avahi-daemon.service >
6.885s bluetooth.service >
6.517s switcheroo-control.service >
6.511s thermald.service >
6.509s systemd-logind.service >
6.508s wpa_supplicant.service >
6.245s dev-loop6.device >
6.073s dev-loop8.device
关键链的输出
graphical.target @1min 12.518s
└─multi-user.target @1min 12.518s
└─postfix.service @1min 3.835s +5ms
└─[email protected] @52.394s +11.435s
└─network-online.target @52.204s
└─NetworkManager-wait-online.service @29.574s +22.628s
└─NetworkManager.service @22.659s +6.908s
└─dbus.service @22.656s
└─basic.target @22.625s
└─sockets.target @22.625s
└─snapd.socket @22.624s +773us
└─sysinit.target @22.421s
└─systemd-timesyncd.service @22.023s +397ms
└─systemd-tmpfiles-setup.service @20.116s +1.777s
└─local-fs.target @20.112s
└─home-xpt1x-data.mount @16.307s +3.805s
└─dev-sda5.device @16.275s
我还注意到，制造商的徽标首先出现约 6-7 秒，然后制造商徽标再次出现，底部的 Ubuntu 徽标与加载旋转器一起出现，甚至在此之后，需要花费太多时间才能到达主屏幕。我发现有些服务花费的时间太长了，请提出解决方案。