我昨天安装了 Ubuntu 20.04，但是我在启动速度慢的问题上苦苦挣扎，在网上找到了这个命令...
这是我的systemd-analyze 责备
1min 45.559s plymouth-quit-wait.service
16.803s networkd-dispatcher.service
16.621s snapd.service
14.686s NetworkManager-wait-online.service
14.194s fwupd-refresh.service
13.107s fwupd.service
12.748s dev-sda4.device
11.411s systemd-journal-flush.service
10.888s accounts-daemon.service
8.994s udisks2.service
7.258s ModemManager.service
7.057s NetworkManager.service
6.930s polkit.service
5.481s dev-loop1.device
5.302s rsyslog.service
4.973s dev-loop5.device
4.573s avahi-daemon.service
4.571s bluetooth.service
4.550s iio-sensor-proxy.service
4.192s thermald.service
4.014s grub-initrd-fallback.service
3.934s switcheroo-control.service
3.924s systemd-logind.service
3.922s wpa_supplicant.service
3.629s grub-common.service
3.326s dev-loop0.device
3.158s dev-loop3.device
3.141s dev-loop2.device
3.139s dev-loop4.device
3.079s apparmor.service
3.063s gdm.service
3.017s gpu-manager.service
2.915s e2scrub_reap.service
2.496s systemd-resolved.service
2.382s apport.service
2.336s systemd-tmpfiles-setup.service
2.153s colord.service
1.920s snapd.seeded.service
1.801s geoclue.service
1.577s systemd-sysctl.service
1.557s plymouth-read-write.service
1.460s [email protected]
1.167s upower.service
1.014s systemd-timesyncd.service
1.012s systemd-random-seed.service
959ms systemd-udevd.service
908ms systemd-modules-load.service
836ms systemd-sysusers.service
814ms systemd-journald.service
769ms plymouth-start.service
767ms snapd.apparmor.service
723ms kerneloops.service
667ms snap-core18-1705.mount
646ms systemd-backlight@backlight:amdgpu_bl0.service
577ms swapfile.swap
573ms snap-gnome\x2d3\x2d34\x2d1804-24.mount
539ms systemd-tmpfiles-setup-dev.service
523ms [email protected]
511ms keyboard-setup.service
502ms snap-gtk\x2dcommon\x2dthemes-1506.mount
477ms systemd-update-utmp.service
458ms pppd-dns.service
396ms snap-snap\x2dstore-433.mount
306ms snap-snapd-7264.mount
303ms systemd-fsck@dev-disk-by\x2duuid-EE80\x2d7926.service
291ms openvpn.service
289ms systemd-user-sessions.service
277ms systemd-remount-fs.service
268ms snap-spotify-41.mount
251ms kmod-static-nodes.service
194ms boot-efi.mount
156ms systemd-rfkill.service
152ms setvtrgb.service
152ms systemd-udev-trigger.service
141ms console-setup.service
137ms systemd-backlight@backlight:acpi_video0.service
106ms systemd-tmpfiles-clean.service
77ms rtkit-daemon.service
67ms ufw.service
61ms dev-hugepages.mount
60ms dev-mqueue.mount
59ms sys-kernel-debug.mount
58ms sys-kernel-tracing.mount
53ms snap-gnome\x2d3\x2d34\x2d1804-27.mount
44ms snap-core18-1754.mount
17ms [email protected]
13ms systemd-update-utmp-runlevel.service
11ms alsa-restore.service
9ms dev-loop7.device
9ms dev-loop6.device
4ms sys-fs-fuse-connections.mount
3ms sys-kernel-config.mount
736us snapd.socket
因此，我发现有很多东西花费了太多时间。
这是我的安装错误吗？还是这是 Ubuntu 20.04 的普遍问题？
还有我的systemd-analyze 关键链
设备激活或启动的时间打印在“@”字符后。设备启动所用的时间打印在“+”字符后。
graphical.target @2min 12.922s
└─multi-user.target @2min 12.922s
└─kerneloops.service @42.239s +723ms
└─network-online.target @41.746s
└─NetworkManager-wait-online.service @27.060s +14.686s
└─NetworkManager.service @20.000s +7.057s
└─dbus.service @19.994s
└─basic.target @19.252s
└─sockets.target @19.252s
└─snapd.socket @19.251s +736us
└─sysinit.target @19.161s
└─systemd-timesyncd.service @18.145s +1.014s
└─systemd-tmpfiles-setup.service @15.767s +2.336s
└─systemd-journal-flush.service @4.354s +11.411s
└─systemd-journald.service @3.537s +814ms
└─systemd-journald.socket @3.531s
└─-.mount @3.526s
└─system.slice @3.526s
└─-.slice @3.526s
