我尝试查看关键链，并设法修复了一些问题，但找不到更多相关信息。我还尝试删除 snap 包及其依赖项。之前的 systemd-journal-flush 也出现了问题，但我将其清除了。我不是内核代码和依赖项方面的专家。
$ systemd-analyze critical-chain
设备激活或启动后的时间打印在“@”字符后。
设备启动所需的时间打印在“+”字符后面。
graphic.target @4分钟 11.302秒
└─multi-user.target @4分钟 11.302秒
└─systemd-user-sessions.service @4分钟 1.267秒 +4毫秒
└─network.target @1分钟336毫秒
└─NetworkManager.service @42.894秒 +17.440秒
└─dbus.service @39.872秒
└─basic.target @39.871秒
└─sockets.target @39.871秒
└─docker.socket @39.466秒+404毫秒
└─sysinit.target@39.460s
└─systemd-backlight@backlight:intel_backlight.service @36.636s +358ms
└─system-systemd\x2dbacklight.slice @36.636s
└─system.slice @5.201秒
└─-.slice @5.142秒
$ systemd-analyze blame
43.632秒docker.service
39.533s dev-sdb5.设备
30.555s snapd.服务
24.986s systemd-journal-flush.服务
23.497秒[电子邮件保护]
21.591s dev-loop24.device
21.479s dev-loop26.device
21.376s dev-loop27.device
21.346s dev-loop15.device
21.328s dev-loop25.device
21.048s dev-loop28.device
20.838s dev-loop19.device
20.677s dev-loop23.device
20.587s dev-loop20.device
20.122s dev-loop21.device
20.054s dev-loop22.device
19.873s networkd-dispatcher.service
19.675s libvirtd.service
19.322s dev-loop11.设备
18.486s dev-loop18.device
18.436s dev-loop14.device
18.295s dev-loop17.device
17.937s dev-loop16.device
17.440s NetworkManager.服务
17.379s uml-utilities.service
16.427s dev-loop8.device
16.324s dev-loop10.device
16.263s dev-loop12.device
16.105s dev-loop13.device
15.876s gpu-manager.service
15.461s dev-loop9.device
12.203s apport-自动报告.服务
11.914s dev-loop4.device
11.668s dev-loop6.device
11.510s dev-loop0.device
11.453s dev-loop7.device
11.212s dev-loop2.device
11.137s dev-loop5.device
10.889s dev-loop3.device
10.065s dev-loop1.device
10.026s plymouth-退出-等待.服务
9.751s upower.service
9.144s apache2.service
8.868s udisks2.服务
8.455s systemd-udevd.service
8.219s ModemManager.服务
6.741s teamviewerd.service
6.348s vboxdrv.服务
6.007s 账户守护进程.服务
5.996s colord.service
5.452s systemd-rfkill.service
5.435s binfmt-support.service
5.137s dns-clean.service
5.097s qemu-kvm.service
4.913s ebtables.服务
4.829s 网络服务
4.777s plymouth-read-write.service
3.928s systemd-sysctl.service
3.906s systemd-tmpfiles-setup.service
3.479s fwupd.service
3.366s thermald.service
3.158s grub-common.service
2.861s snap-core-9289.mount
2.859s systemd-tmpfiles-setup-dev.service
2.855s 控制台设置.服务
2.733s wpa_supplicant.service
2.630s snap-gnome\x2dsystem\x2dmonitor-145.mount
2.590s snap-spotify-41.mount
2.580s lvm2-monitor.service
2.415s 蓝牙服务
2.363s systemd-modules-load.service
2.234s apport.service
2.158s 语音调度服务
2.076s apparmor.service
2.005s rsyslog.service
1.968s snap-gnome\x2dcalculator-748.mount
1.910s snap-gnome\x2d3\x2d28\x2d1804-128.mount
1.909s snap-core18-1754.mount
1.894s snap-gnome\x2dclocks-257.mount
1.888s snap-gnome\x2dlogs-93.mount
1.847s snap-gnome\x2d3\x2d26\x2d1604-100.mount
1.832s systemd-logind.service
1.772s avahi-daemon.service
1.767s alsa-恢复.服务
1.762s nvidia-persistenced.service
1.756s sysstat.service
1.755s pppd-dns.服务
1.676s snap-gnome\x2d3\x2d34\x2d1804-33.mount
1.657s snap-gtk\x2dcommon\x2dthemes-1506.mount
1.657s 键盘设置.服务
1.585s snap-gnome\x2d3\x2d34\x2d1804-36.mount
1.580s snap-postgresql10-47.mount
1.578s snap-eclipse-40.mount
1.562s snap-eclipse-48.mount
1.394s snap-spotify-36.mount
1.251s snap-core-9066.mount
1.248s snap-gnome\x2d3\x2d28\x2d1804-116.mount
1.198s snap-sublime\x2dtext-85.mount
1.188s snap-gnome\x2dcharacters-550.mount
1.185s systemd-journald.service
1.079s proc-sys-fs-binfmt_misc.mount
1.056s snap-sublime\x2dtext-77.mount
1.040s snap-gnome\x2d3\x2d26\x2d1604-98.mount
1.028s snap-gnome\x2dclocks-261.mount
1.005s snap-core18-1705.mount
1.004s snap-gnome\x2dsystem\x2dmonitor-148.mount
979ms systemd-random-seed.service
955ms snap-gnome\x2dlogs-100.mount
953ms snap-gnome\x2dcharacters-539.mount
953ms snap-gnome\x2dcalculator-730.mount
792ms kerneloops.service
744ms swapfile.swap
715ms systemd-询问密码-wall.service
686ms snap-gtk\x2dcommon\x2dthemes-1502.mount
651ms systemd-remount-fs.service
625ms openvpn.service
624ms containerd.service
605ms dev-mqueue.mount
603ms 系统内核调试.mount
603ms dev-hugepages.mount
575ms systemd-timesyncd.service
566ms systemd-resolved.service
504ms polkit.service
481ms systemd-update-utmp.service
468ms plymouth-start.service
419ms snapd.seed.service
409ms snapd.socket
404毫秒docker.socket
358ms systemd-backlight@backlight:intel_backlight.service
280毫秒[电子邮件保护]
211ms libvirt-guests.service
196ms packagekit.service
182ms kmod-静态节点.service
133ms bolt.service
120毫秒[电子邮件保护]
105ms gdm.服务
104ms blk-可用性.服务
90ms ufw.服务
74ms rtkit-daemon.service
59ms systemd-udev-trigger.service
37ms setvtrgb.service
15ms vboxweb-service.服务
9ms systemd-update-utmp-runlevel.service
8ms ureadahead-stop.service
4ms vboxballoonctrl-service.service
4ms vboxautostart-service.service
4ms systemd-用户会话.服务
1ms postgresql.服务
1ms 系统内核配置.mount
1ms 系统文件系统保险丝连接.mount