[Bug 1769309] Re: Ubuntu 18.04 boot extremely slow

[Angelo Giacomini Ribas]

Same problem here after upgrading to kernel 4.5.0-24.26:

user at 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 at 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 at 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 at 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

Status in plymouth package in Ubuntu:
  Confirmed

Bug description:
  I have upgraded Ubuntu 16.04 (amd64) using Gnome as desktop to Ubuntu
  18.04. Ubuntu 16.04 took just over 20 seconds from the time a
  selection on the Grub boot menu was made until the login screen was
  displayed. On Ubuntu 18.04 it takes about 20 seconds (from Grub menu)
  to display the boot splash screen and in total it takes about 2min
  30sec until the login menu (gdm) is displayed.

  Expected behaviour: 
  I would expect a new LTS release to have a similar boot time than the previous release. At this time I am experiencing boot times slower that those I had a few years ago from a traditional hard drive (which used to be just under 2min)

  Additional information:
  I have recently built two Ubuntu servers (17.10 in expectation of upgrading to 18.04 upon release). I found that the boot process went fairly smooth right until the end where it seems to wait for about a minute for what seems to be a network connection. After that wait period the text login prompt is displayed. So I am guessing that there might be a service start timeout which blocks the process.

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 18.04 LTS
  Release:	18.04
  Codename:	bionic

  $ uname -a
  Linux popeye 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

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