Same problem here after upgrading to kernel 4.5.0-24.26:
user@machine:~$ sudo systemd-analyze blame
7min 50.750s plymouth-quit-wait.service
6min 17.955s snapd.seeded.service
15.700s snapd.service
6.253s NetworkManager-wait-online.service
1.502s dev-mapper-ubuntu\x2d\x2dvg\x2droot.device
1.231s dev-loop0.device
1.223s dev-loop1.device
1.203s dev-loop2.device
1.182s dev-loop3.device
737ms fwupd.service
265ms networkd-dispatcher.service
253ms NetworkManager.service
244ms plymouth-start.service
230ms apparmor.service
223ms udisks2.service
199ms ModemManager.service
190ms keyboard-setup.service
182ms systemd-logind.service
177ms systemd-journal-flush.service
173ms accounts-daemon.service
168ms systemd-udev-trigger.service
149ms systemd-rfkill.service
132ms speech-dispatcher.service
127ms apport.service
125ms systemd-timesyncd.service
123ms avahi-daemon.service
122ms systemd-resolved.service
112ms bluetooth.service
109ms packagekit.service
109ms systemd-journald.service
106ms grub-common.service
99ms lvm2-pvscan@8:1.service
95ms lvm2-monitor.service
93ms wpa_supplicant.service
89ms upower.service
85ms thermald.service
81ms networking.service
81ms pppd-dns.service
lines 1-38
However, interestingly, if I move mouse while booting, the output differs
greatly:
user@machine:~$ sudo systemd-analyze blame
6.294s NetworkManager-wait-online.service
4.453s plymouth-quit-wait.service
1.474s dev-mapper-ubuntu\x2d\x2dvg\x2droot.device
1.257s dev-loop0.device
1.246s dev-loop1.device
1.227s dev-loop2.device
1.204s dev-loop3.device
1.060s snapd.service
749ms fwupd.service
410ms apparmor.service
333ms networkd-dispatcher.service
327ms udisks2.service
255ms NetworkManager.service
247ms plymouth-start.service
216ms ModemManager.service
199ms systemd-rfkill.service
195ms accounts-daemon.service
190ms systemd-journal-flush.service
168ms systemd-logind.service
157ms systemd-timesyncd.service
154ms keyboard-setup.service
150ms systemd-resolved.service
137ms systemd-udev-trigger.service
122ms thermald.service
110ms grub-common.service
109ms avahi-daemon.service
106ms wpa_supplicant.service
103ms systemd-journald.service
102ms apport.service
102ms bluetooth.service
97ms packagekit.service
94ms networking.service
93ms upower.service
90ms lvm2-pvscan@8:1.service
90ms lvm2-monitor.service
83ms gpu-manager.service
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https://bugs.launchpad.net/bugs/1769309
Title:
Ubuntu 18.04 boot extremely slow
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