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When the upgrade is finished, reboot when prompted (the security central server processes won't start after reboot since 16.04 and 18.04 use systemd and the startup scripts are still in upstart format).
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When the upgrade is finished, reboot when prompted (the security central server processes won't start after reboot since 16.04 and 18.04 use systemd and the startup scripts are still in upstart format).
...