我附上了显示systemd-analyze启动我的 PC 大约需要 1 分 50 秒的输出。除此之外，我的应用程序打开速度非常慢（Chrome、Klyaout、MATLAB 等）。我的技术水平不高，如果需要进一步挖掘才能找到答案，也请告诉我。
:~$ systemd-analyze
Startup finished in 30.147s (firmware) + 13.579s (loader) + 3.658s (kernel) + 1min 3.422s (userspace) = 1min 50.807s
graphical.target reached after 1min 3.378s in userspace
我读过一些关于 amd-ryzen 和 nvidia 的文章（我有），但我在 18.04 上遇到了这些问题，而且一切正常，我不能说这些问题是否会给我带来问题。
我现在添加了结果systemd-analyze blame：
35.298s plymouth-quit-wait.service
21.787s man-db.service
16.798s networkd-dispatcher.service
13.833s systemd-journal-flush.service
13.442s snapd.service
11.710s udisks2.service
11.560s dev-sdb5.device
9.847s logrotate.service
9.765s NetworkManager-wait-online.service
8.394s accounts-daemon.service
8.199s polkit.service
7.343s avahi-daemon.service
7.341s bluetooth.service
7.332s NetworkManager.service
7.301s switcheroo-control.service
7.297s thermald.service
7.297s systemd-logind.service
7.295s wpa_supplicant.service
5.014s dev-loop8.device
4.691s dev-loop3.device
4.154s dev-loop13.device
4.001s dev-loop7.device
3.941s dev-loop11.device
3.904s grub-common.service
3.903s dev-loop10.device
3.858s apport.service
3.857s dev-loop12.device
3.725s dev-loop14.device
3.672s gpu-manager.service
3.651s ModemManager.service
3.639s dev-loop9.device
3.529s dev-loop1.device
3.497s dev-loop0.device
3.433s dev-loop5.device
3.409s dev-loop6.device
3.223s dev-loop2.device
3.199s dev-loop4.device
2.837s systemd-fsck@dev-disk-by\x2duuid-0CFC\x2dE96E.service
2.799s [email protected]
2.691s fwupd.service
2.537s gdm.service
2.367s systemd-resolved.service
1.953s rsyslog.service
1.723s systemd-udevd.service
1.701s plymouth-start.service
1.676s e2scrub_reap.service
1.612s grub-initrd-fallback.service
1.604s fwupd-refresh.service
1.406s apparmor.service
1.131s systemd-sysctl.service
813ms systemd-modules-load.service
812ms snap-core18-1932.mount
696ms snap-gnome\x2d3\x2d28\x2d1804-128.mount
667ms snap-snap\x2dstore-481.mount
657ms snap-core-10126.mount
619ms snap-core-10185.mount
602ms pppd-dns.service
596ms snap-snap\x2dstore-467.mount
562ms snapd.apparmor.service
550ms nvidia-persistenced.service
545ms systemd-journald.service
540ms snap-gtk\x2dcommon\x2dthemes-1506.mount
528ms upower.service
513ms snapd.seeded.service
511ms systemd-sysusers.service
502ms snap-gnome\x2d3\x2d34\x2d1804-36.mount
473ms systemd-random-seed.service
453ms keyboard-setup.service
441ms systemd-rfkill.service
440ms systemd-tmpfiles-setup.service
423ms swapfile.swap
408ms snap-qucs\x2dspice-4.mount
395ms snap-core18-1885.mount
386ms snap-snapd-9721.mount
384ms snap-teams\x2dfor\x2dlinux-105.mount
384ms [email protected]
369ms snap-gnome\x2d3\x2d34\x2d1804-60.mount
352ms snap-gnome\x2d3\x2d28\x2d1804-145.mount
330ms systemd-tmpfiles-setup-dev.service
318ms colord.service
270ms kerneloops.service
248ms snap-snapd-9607.mount
242ms openvpn.service
237ms systemd-user-sessions.service
218ms systemd-udev-trigger.service
171ms systemd-timesyncd.service
168ms ufw.service
153ms console-setup.service
152ms dev-hugepages.mount
152ms dev-mqueue.mount
151ms sys-kernel-debug.mount
151ms sys-kernel-tracing.mount
149ms kmod-static-nodes.service
148ms systemd-remount-fs.service
114ms boot-efi.mount
93ms [email protected]
72ms plymouth-read-write.service
68ms rtkit-daemon.service
52ms [email protected]
43ms setvtrgb.service
17ms systemd-update-utmp.service
13ms alsa-restore.service
7ms [email protected]
6ms systemd-tmpfiles-clean.service
6ms systemd-update-utmp-runlevel.service
1ms sys-fs-fuse-connections.mount
1ms sys-kernel-config.mount
514us snapd.socket
我还添加了以下结果systemd-analyze critical-chain：
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.
graphical.target @1min 3.378s
└─multi-user.target @1min 3.378s
└─kerneloops.service @37.662s +270ms
└─network-online.target @37.600s
└─NetworkManager-wait-online.service @27.834s +9.765s
└─NetworkManager.service @20.500s +7.332s
└─dbus.service @20.495s
└─basic.target @20.463s
└─sockets.target @20.463s
└─snapd.socket @20.462s +514us
└─sysinit.target @20.340s
└─snapd.apparmor.service @19.777s +562ms
└─apparmor.service @18.370s +1.406s
└─local-fs.target @18.369s
└─run-user-125-gvfs.mount @43.383s
└─run-user-125.mount @36.280s
└─local-fs-pre.target @4.500s
└─systemd-tmpfiles-setup-dev.service @4.170s +330ms
└─systemd-sysusers.service @3.658s +511ms
└─systemd-remount-fs.service @3.489s +148ms
└─systemd-journald.socket @3.338s
└─system.slice @3.335s
└─-.slice @3.335s