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comme ça

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systemd-analyze blame > demarrage1.txt

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systemd-analyze critical-chain > demarrage2.txt

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14.860s plocate-updatedb.service
11.564s logrotate.service
10.506s e2scrub_reap.service
10.443s blueman-mechanism.service
 9.864s systemd-udev-settle.service
 6.963s NetworkManager.service
 6.347s udisks2.service
 6.259s dev-sda6.device
 5.934s dpkg-db-backup.service
 5.751s NetworkManager-wait-online.service
 5.231s accounts-daemon.service
 4.938s systemd-journal-flush.service
 4.126s polkit.service
 4.025s ubuntu-system-adjustments.service
 3.694s ModemManager.service
 3.678s avahi-daemon.service
 3.674s bluetooth.service
 3.648s dbus.service
 3.448s switcheroo-control.service
 3.442s thermald.service
 2.202s plymouth-start.service
 2.184s systemd-udevd.service
 2.143s rsyslog.service
 2.013s lvm2-monitor.service
 1.877s zfs-load-module.service
 1.685s wpa_supplicant.service
 1.316s ufw.service
 1.289s gpu-manager.service
 1.276s apparmor.service
 1.191s lightdm.service
 1.171s plymouth-quit-wait.service
 1.108s apt-daily-upgrade.service
  947ms grub-common.service
  933ms systemd-udev-trigger.service
  906ms cups.service
  885ms systemd-resolved.service
  875ms systemd-modules-load.service
  862ms systemd-tmpfiles-setup-dev-early.service
  860ms systemd-sysctl.service
  787ms keyboard-setup.service
  644ms user@1000.service
  586ms upower.service
  535ms systemd-tmpfiles-setup.service
  524ms systemd-random-seed.service
  519ms grub-initrd-fallback.service
  435ms casper-md5check.service
  398ms systemd-timesyncd.service
  397ms swapfile.swap
  368ms systemd-logind.service
  277ms systemd-journald.service
  257ms systemd-rfkill.service
  221ms lm-sensors.service
  213ms console-setup.service
  182ms colord.service
  148ms systemd-binfmt.service
  123ms zfs-mount.service
  122ms zfs-volume-wait.service
  120ms systemd-remount-fs.service
  103ms systemd-tmpfiles-clean.service
  102ms rtkit-daemon.service
   91ms systemd-update-utmp.service
   80ms kerneloops.service
   62ms kmod-static-nodes.service
   60ms setvtrgb.service
   53ms systemd-user-sessions.service
   50ms plymouth-read-write.service
   44ms finalrd.service
   37ms motd-news.service
   34ms user-runtime-dir@1000.service
   32ms dev-hugepages.mount
   31ms dev-mqueue.mount
   30ms sys-kernel-debug.mount
   30ms sys-kernel-tracing.mount
   30ms proc-sys-fs-binfmt_misc.mount
   22ms modprobe@configfs.service
   21ms modprobe@drm.service
   19ms modprobe@fuse.service
   18ms alsa-restore.service
   14ms zfs-share.service
   12ms systemd-update-utmp-runlevel.service
   12ms openvpn.service
   11ms getty@tty1.service
    9ms systemd-tmpfiles-setup-dev.service
    8ms modprobe@efi_pstore.service
    7ms modprobe@loop.service
    5ms sys-fs-fuse-connections.mount
    5ms sys-kernel-config.mount
    3ms modprobe@dm_mod.service
   31us blk-availability.service

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The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

graphical.target @34.875s
└─multi-user.target @34.875s
  └─kerneloops.service @34.794s +80ms
    └─network-online.target @34.759s
      └─NetworkManager-wait-online.service @29.005s +5.751s
        └─NetworkManager.service @22.028s +6.963s
          └─dbus.service @18.360s +3.648s
            └─basic.target @18.346s
              └─sockets.target @18.345s
                └─cups.socket @20.878s
                  └─sysinit.target @18.343s
                    └─systemd-resolved.service @17.457s +885ms
                      └─systemd-tmpfiles-setup.service @16.902s +535ms
                        └─local-fs.target @16.823s
                          └─zfs-mount.service @16.698s +123ms
                            └─zfs-import.target @16.671s

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systemd-analyze