I update my ubuntu recenly to 20.04. now it takes a long time to boot. I have I5 CPU and 8G RAM.
Here the cmd systemd-analyze blame output:
1min 30.094s nmbd.service
47.725s plymouth-quit-wait.service
22.834s udisks2.service
22.771s networkd-dispatcher.service
19.079s snapd.service
16.775s dev-sda6.device
16.618s accounts-daemon.service
15.567s NetworkManager-wait-online.service
11.738s polkit.service
11.591s avahi-daemon.service
11.590s bluetooth.service
11.498s NetworkManager.service
10.792s switcheroo-control.service
10.786s thermald.service
10.782s systemd-logind.service
10.780s wpa_supplicant.service
9.671s ModemManager.service
7.797s dev-loop0.device
7.371s dev-loop1.device
6.890s dev-loop2.device
6.884s fwupd.service
6.669s dev-loop4.device
5.474s systemd-journal-flush.service
5.311s dev-loop3.device
5.240s bolt.service
4.621s systemd-resolved.service
4.481s ufw.service
3.997s rsyslog.service
3.761s apport.service
3.673s gpu-manager.service
3.362s systemd-udevd.service
3.018s grub-common.service
2.985s e2scrub_reap.service
2.829s systemd-tmpfiles-setup.service
2.615s gdm.service
2.605s grub-initrd-fallback.service
2.412s networking.service
2.334s apparmor.service
1.970s secureboot-db.service
1.919s lm-sensors.service
1.549s snapd.seeded.service
1.427s virtualbox.service
1.419s dictd.service
1.388s systemd-sysusers.service
1.360s keyboard-setup.service
1.333s systemd-modules-load.service
1.328s systemd-fsck@dev-disk-by\x2duuid-CEF1\x2d926B.service
1.314s colord.service
1.221s ccpd.service
1.004s systemd-tmpfiles-setup-dev.service
997ms systemd-random-seed.service
888ms systemd-sysctl.service
794ms [email protected]
789ms smbd.service
770ms snapd.apparmor.service
755ms binfmt-support.service
646ms upower.service
639ms systemd-backlight@backlight:intel_backlight.service
633ms systemd-rfkill.service
580ms winbind.service
542ms snap-core18-1932.mount
516ms pppd-dns.service
412ms systemd-udev-trigger.service
407ms systemd-timedated.service
384ms snap-snap\x2dstore-481.mount
351ms kerneloops.service
335ms ifupdown-pre.service
275ms systemd-timesyncd.service
274ms rc-local.service
231ms kmod-static-nodes.service
218ms console-setup.service
217ms [email protected]
213ms snap-gnome\x2d3\x2d34\x2d1804-60.mount
200ms snap-gtk\x2dcommon\x2dthemes-1506.mount
200ms systemd-remount-fs.service
200ms systemd-journald.service
195ms openvpn.service
182ms dev-hugepages.mount
182ms dev-mqueue.mount
180ms sys-kernel-debug.mount
180ms sys-kernel-tracing.mount
156ms dev-disk-by\x2duuid-0dddf165\x2d43ec\x2d452e\x2d9e15\x2da64e2699cdfa.swap
153ms snap-snapd-9721.mount
141ms proc-sys-fs-binfmt_misc.mount
139ms plymouth-start.service
133ms systemd-user-sessions.service
126ms setvtrgb.service
117ms dns-clean.service
116ms systemd-update-utmp.service
110ms boot-efi.mount
106ms rtkit-daemon.service
69ms hddtemp.service
67ms systemd-tmpfiles-clean.service
55ms plymouth-read-write.service
49ms [email protected]
45ms resolvconf-pull-resolved.service
41ms systemd-update-utmp-runlevel.service
16ms alsa-restore.service
4ms sys-fs-fuse-connections.mount
3ms sys-kernel-config.mount
1ms snapd.socket
and systemd-analyze critical-chain output
graphical.target @2min 25.659s
└─multi-user.target @2min 25.658s
└─smbd.service @2min 24.867s +789ms
└─winbind.service @2min 24.280s +580ms
└─network.target @38.518s
└─NetworkManager.service @27.019s +11.498s
└─dbus.service @27.013s
└─basic.target @26.670s
└─sockets.target @26.670s
└─snapd.socket @26.668s +1ms
└─sysinit.target @26.291s
└─systemd-timesyncd.service @26.015s +275ms
└─systemd-tmpfiles-setup.service @23.107s +2.829s
└─local-fs.target @22.985s
└─boot-efi.mount @22.875s +110ms
└─systemd-fsck@dev-disk-by\x2duuid-CEF1\x2d926B.service @21.528s +1.328s
└─dev-disk-by\x2duuid-CEF1\x2d926B.device @21.526s
Here systemd-analyze plot result.
Is there a solution to this problem?
It looks like 2 specific events are slowing it down:
it is waiting for the network connection to become available
it is waiting for winbind/nmbd to do something, possible get a list of all host names on your network
Removing winbind/nmbd or disabling those services should speed it up significantly.
The network wait time seems to be 11s out of your huge delay, but as long as you are not automounting smb or nfs, or are using LDAP for login, you can skip that, and save the 11s