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Hi i have a small problem when i turn on PC boot time take a long time. Can someone help me to speed up. What i supposed turn off and how?

Startup finished in 9.057s (firmware) + 4.556s (loader) + 4.738s (kernel) + 20.037s (userspace) = 38.389s graphical.target reached after 20.021s in userspace

     12.597s dev-sda2.device
     10.703s systemd-journal-flush.service
      5.888s lvm2-monitor.service
      5.415s systemd-tmpfiles-setup-dev.service
      5.402s snapd.service
      4.444s udisks2.service
      4.220s pantheon-parental-controls.service
      4.188s ModemManager.service
      3.568s accounts-daemon.service
      3.564s systemd-sysctl.service
      3.217s NetworkManager.service
      2.734s networkd-dispatcher.service
      2.044s systemd-modules-load.service
      1.938s thermald.service
      1.853s systemd-udevd.service
      1.542s keyboard-setup.service
      1.316s gpu-manager.service
      1.009s grub-common.service
       928ms wpa_supplicant.service
       907ms avahi-daemon.service
       814ms polkit.service
       799ms nvidia-persistenced.service
       670ms lightdm.service
       670ms plymouth-quit-wait.service
       494ms apparmor.service
       470ms kmod-static-nodes.service
       431ms systemd-fsck@dev-disk-by\x2duuid-698D\x2dBA07.service
       425ms packagekit.service
       360ms systemd-random-seed.service
       332ms rsyslog.service
       306ms swapfile.swap
       260ms blk-availability.service
       253ms systemd-journald.service
       247ms systemd-remount-fs.service
       216ms systemd-logind.service
       213ms systemd-update-utmp.service
       209ms dev-mqueue.mount
       208ms sys-kernel-debug.mount
       207ms systemd-resolved.service
       204ms systemd-timesyncd.service
       188ms ufw.service
       178ms upower.service
       178ms systemd-tmpfiles-setup.service
       169ms plymouth-read-write.service
       150ms snapd.seeded.service
       134ms plymouth-start.service
       123ms setvtrgb.service
       111ms kerneloops.service
       101ms dev-hugepages.mount
        95ms systemd-udev-trigger.service
        58ms colord.service
        54ms user@1000.service
        40ms rtkit-daemon.service
        38ms boot-efi.mount
        33ms snapd.socket
        17ms pppd-dns.service
        16ms ureadahead-stop.service
        15ms speech-dispatcher.service
        15ms alsa-restore.service
        14ms systemd-update-utmp-runlevel.service
         4ms console-setup.service
         2ms systemd-user-sessions.service
         2ms sys-fs-fuse-connections.mount
         2ms sys-kernel-config.mount
         1ms openvpn.service

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