我的启动速度真的很慢，我会发布我的 boot.log，有人能找出原因吗？
内容systemd-analyze blame
20.874s dev-sda7.device
18.101s keyboard-setup.service
17.900s systemd-tmpfiles-setup-dev.service
15.091s nmbd.service
7.179s NetworkManager-wait-online.service
6.931s click-system-hooks.service
6.627s ModemManager.service
4.703s accounts-daemon.service
4.338s smbd.service
4.120s grub-common.service
3.919s NetworkManager.service
3.760s repowerd.service
3.758s [email protected]
3.669s systemd-sysctl.service
2.344s fwupd.service
1.863s upower.service
1.808s colord.service
1.700s avahi-daemon.service
1.684s lightdm.service
1.683s plymouth-quit-wait.service
1.591s wpa_supplicant.service
1.126s udisks2.service
1.008s run-rpc_pipefs.mount
963ms rsyslog.service
945ms systemd-fsck@dev-disk-by\x2duuid-6E38\x2dB283.service
944ms polkit.service
834ms apport.service
748ms [email protected]
681ms dev-mqueue.mount
680ms dev-hugepages.mount
679ms sys-kernel-debug.mount
645ms apparmor.service
575ms lm-sensors.service
552ms tlp.service
512ms rtirq.service
507ms thermald.service
475ms vboxdrv.service
454ms irqbalance.service
446ms nvidia-persistenced.service
367ms systemd-journald.service
311ms binfmt-support.service
303ms dns-clean.service
280ms systemd-resolved.service
225ms systemd-update-utmp.service
224ms ufw.service
208ms systemd-timesyncd.service
187ms networking.service
165ms systemd-logind.service
160ms kmod-static-nodes.service
152ms systemd-tmpfiles-setup.service
126ms plymouth-read-write.service
126ms packagekit.service
110ms setvtrgb.service
101ms systemd-tmpfiles-clean.service
92ms dev-sda8.swap
71ms boot-efi.mount
49ms systemd-udevd.service
47ms rpcbind.service
43ms systemd-udev-trigger.service
24ms systemd-remount-fs.service
22ms bluetooth.service
21ms speech-dispatcher.service
20ms rtkit-daemon.service
18ms switcheroo-control.service
15ms pppd-dns.service
15ms systemd-journal-flush.service
14ms alsa-restore.service
12ms plymouth-start.service
12ms glances.service
11ms nscd.service
7ms snapd.autoimport.service
5ms hddtemp.service
3ms resolvconf.service
3ms proc-sys-fs-binfmt_misc.mount
3ms ureadahead-stop.service
2ms systemd-backlight@backlight:acpi_video0.service
2ms systemd-update-utmp-runlevel.service
2ms systemd-backlight@backlight:acpi_video1.service
2ms nfs-config.service
2ms vboxballoonctrl-service.service
2ms vboxautostart-service.service
2ms systemd-backlight@backlight:intel_backlight.service
2ms vboxweb-service.service
2ms systemd-random-seed.service
2ms systemd-backlight@leds:asus::kbd_backlight.service
1ms systemd-modules-load.service
1ms console-setup.service
1ms systemd-user-sessions.service
1ms openvpn.service
1ms sys-fs-fuse-connections.mount
492us snapd.socket
内容systemd-analyze critical-chain
graphical.target @1min 59.841s
└─multi-user.target @1min 59.841s
└─nmbd.service @1min 44.749s +15.091s
└─network-online.target @1min 44.748s
└─NetworkManager-wait-online.service @1min 37.568s +7.179s
└─NetworkManager.service @1min 33.648s +3.919s
└─dbus.service @1min 33.517s
└─basic.target @1min 33.515s
└─sockets.target @1min 33.515s
└─snapd.socket @1min 33.514s +492us
└─sysinit.target @1min 33.437s
└─apparmor.service @25.098s +645ms
└─local-fs.target @25.097s
└─run-user-1000-gvfs.mount @1min 55.993s
└─run-user-1000.mount @1min 52.689s
└─local-fs-pre.target @21.417s
└─systemd-remount-fs.service @21.391s +24ms
└─system.slice @3.222s
└─-.slice @2.636s