Solution to slow booting

[dihonomo]

I have just found a great blog-post on speeding-up a slow boot here:  https://www.dedoimedo.com/computers/ubun...-boot.html

Before:

Code:

systemd-analyze
Startup finished in 9.259s (kernel) + 50.555s (userspace) = 59.815s
graphical.target reached after 50.545s in userspace

Code:

systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

graphical.target @50.545s
└─multi-user.target @50.545s
  └─smbd.service @43.502s +7.043s
    └─nmbd.service @26.375s +17.124s
      └─network-online.target @26.374s
        └─NetworkManager-wait-online.service @21.157s +5.216s
          └─NetworkManager.service @16.400s +4.751s
            └─dbus.service @15.213s
              └─basic.target @14.954s
                └─paths.target @14.954s
                  └─acpid.path @14.954s
                    └─sysinit.target @14.867s
                      └─apparmor.service @12.237s +2.599s
                        └─local-fs.target @12.181s
                          └─run-user-1000-gvfs.mount @39.479s
                            └─run-user-1000.mount @35.576s
                              └─swap.target @9.917s
                                └─dev-disk-by\x2duuid-420eef95\x2d688c\x2d40bd\x2dab12\x2d8662342ff8de.swap @8.521s +1.395s
                                  └─dev-disk-by\x2duuid-420eef95\x2d688c\x2d40bd\x2dab12\x2d8662342ff8de.device @8.520s

After analyzing the log files as explained in the post I linked to above I noticed that the main slow-down was caused by NetworkManager waiting for IPv6 to activate. As I hadn't enabled any support for it on my network, I just disabled it in "NetworkManager -> Edit Connections -> IPv6 Settings: Ignore".

This shaved off another 20 seconds from the boot process:

Code:

systemd-analyze
Startup finished in 9.235s (kernel) + 30.131s (userspace) = 39.366s
graphical.target reached after 30.124s in userspace

Code:

systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

graphical.target @30.124s
└─multi-user.target @30.124s
  └─smbd.service @29.666s +457ms
    └─nmbd.service @24.134s +5.530s
      └─network-online.target @24.132s
        └─NetworkManager-wait-online.service @20.163s +3.969s
          └─NetworkManager.service @16.606s +3.553s
            └─dbus.service @16.388s
              └─basic.target @16.336s
                └─sockets.target @16.336s
                  └─avahi-daemon.socket @16.336s
                    └─sysinit.target @16.305s
                      └─systemd-timesyncd.service @16.097s +207ms
                        └─systemd-tmpfiles-setup.service @15.994s +101ms
                          └─systemd-journal-flush.service @3.718s +12.274s
                            └─systemd-remount-fs.service @2.633s +1.084s
                              └─systemd-journald.socket @2.602s
                                └─system.slice @2.602s
                                  └─-.slice @2.244s

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