以下是该命令的结果systemd-analyze：
Startup finished in 5.359s (kernel) + 1min 55.199s (userspace) = 2min 559ms
graphical.target reached after 1min 53.510s in userspace
请告诉我如何减少这个时间。我最近（一周前）安装了 ubuntu 20.04 并从 Windows 转移到了 Linux。
的输出systemd-analyze blame是
1min 15.371s plymouth-quit-wait.service
21.162s dev-sda5.device
20.968s snapd.service
18.507s networkd-dispatcher.service
16.409s NetworkManager-wait-online.service
14.704s udisks2.service
14.419s systemd-journal-flush.service
13.434s dev-loop15.device
13.030s dev-loop13.device
13.015s dev-loop14.device
12.317s dev-loop4.device
12.310s dev-loop10.device
11.607s dev-loop11.device
11.528s dev-loop12.device
11.273s dev-loop8.device
11.231s dev-loop9.device
10.697s dev-loop7.device
10.413s accounts-daemon.service
9.316s dev-loop2.device
9.212s dev-loop1.device
8.789s dev-loop6.device
8.433s dev-loop5.device
8.088s dev-loop3.device
7.922s dev-loop0.device
7.854s avahi-daemon.service
7.841s bluetooth.service
7.798s NetworkManager.service
7.439s polkit.service
7.152s systemd-resolved.service
6.830s switcheroo-control.service
6.797s thermald.service
6.770s systemd-logind.service
6.769s wpa_supplicant.service
6.123s apport-autoreport.service
4.622s ModemManager.service
4.310s fwupd.service
4.028s apport.service
3.938s gpu-manager.service
3.834s grub-common.service
3.408s rsyslog.service
3.040s systemd-udevd.service
2.802s e2scrub_reap.service
2.794s upower.service
2.506s systemd-journald.service
2.329s gdm.service
1.977s systemd-timesyncd.service
1.685s apparmor.service
1.652s tlp.service
1.646s grub-initrd-fallback.service
1.309s systemd-sysctl.service
1.153s systemd-tmpfiles-setup.service
935ms systemd-modules-load.service
931ms snapd.apparmor.service
918ms lm-sensors.service
834ms systemd-random-seed.service
814ms geoclue.service
803ms snap-canonical\x2dlivepatch-95.mount
798ms snap-core-9436.mount
795ms snap-core18-1705.mount
761ms systemd-udev-trigger.service
758ms snap-core18-1754.mount
680ms snap-gnome\x2d3\x2d28\x2d1804-128.mount
656ms [email protected]
649ms swapfile.swap
642ms pppd-dns.service
612ms snap-gnome\x2d3\x2d34\x2d1804-24.mount
604ms keyboard-setup.service
560ms snap-gnome\x2d3\x2d34\x2d1804-36.mount
557ms systemd-sysusers.service
518ms snap-gtk\x2dcommon\x2dthemes-1506.mount
471ms snap-mpg123\x2dcm-21.mount
459ms systemd-tmpfiles-setup-dev.service
452ms snap-snap\x2dstore-433.mount
427ms snap-snap\x2dstore-467.mount
417ms plymouth-start.service
381ms [email protected]
381ms kerneloops.service
376ms snap-snapd-7264.mount
365ms hddtemp.service
361ms snap-snapd-8140.mount
315ms colord.service
291ms dev-hugepages.mount
288ms dev-mqueue.mount
288ms systemd-tmpfiles-clean.service
284ms sys-kernel-debug.mount
281ms sys-kernel-tracing.mount
277ms ufw.service
265ms snapd.seeded.service
264ms kmod-static-nodes.service
238ms openvpn.service
237ms snap-vlc-1700.mount
233ms console-setup.service
230ms snap-standard\x2dnotes-10.mount
195ms systemd-user-sessions.service
182ms systemd-backlight@backlight:radeon_bl0.service
176ms snap-stellarium\x2ddaily-152.mount
159ms systemd-fsck@dev-disk-by\x2duuid-016D\x2d2379.service
158ms systemd-remount-fs.service
134ms plymouth-read-write.service
116ms [email protected]
114ms systemd-backlight@backlight:acpi_video0.service
110ms systemd-update-utmp.service
77ms setvtrgb.service
68ms rtkit-daemon.service
65ms boot-efi.mount
45ms systemd-update-utmp-runlevel.service
43ms alsa-restore.service
25ms sys-fs-fuse-connections.mount
14ms sys-kernel-config.mount
6ms snapd.socket
这些是该命令的图像systemd-analyze plot > ~/SystemdAnalyzePlot.svg：
的结果systemd-analyze critical-chain
graphical.target @1min 22.613s
└─multi-user.target @1min 22.611s
└─snapd.seeded.service @49.338s +210ms
└─snapd.service @27.294s +22.036s
└─basic.target @26.230s
└─sockets.target @26.230s
└─snapd.socket @26.219s +10ms
└─sysinit.target @25.902s
└─systemd-timesyncd.service @23.836s +2.065s
└─systemd-tmpfiles-setup.service @23.116s +660ms
└─local-fs.target @23.087s
└─run-snapd-ns-canonical\x2dlivepatch.mnt.mount @43.350s
└─run-snapd-ns.mount @39.627s
└─local-fs-pre.target @5.484s
└─systemd-tmpfiles-setup-dev.service @5.120s +363ms
└─systemd-sysusers.service @4.604s +513ms
└─systemd-remount-fs.service @4.137s +191ms
└─systemd-journald.socket @3.897s
└─-.mount @3.866s
└─system.slice @3.866s
└─-.slice @3.866s
答案1
sudo nano /etc/default/grub- 找到此行 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
- 更改为 GRUB_CMDLINE_LINUX_DEFAULT="quiet"
sudo update-grub
重启
答案2
让我们首先检查您的文件系统是否有错误。
要检查 Ubuntu 分区上的文件系统...启动到 GRUB 菜单 > 选择高级选项 > 选择恢复模式 > 选择 Root 访问权限和fsck -f /dev/sda5
如果有错误，请重复 fsck 命令 > 输入 reboot
答案3
尝试运行启动修复，这会自动修复大多数启动问题，以下是如何安装它以及它的作用的链接https://help.ubuntu.com/community/Boot-Repair