The package "unattended-upgrades", in Trisquel's default system, may be the reason why security updates need no authentication. It can be reconfigured through the Synaptic package manager or with the command 'sudo dpkg-reconfigure unattended-upgrades'. Editing /etc/apt/apt.conf.d/50unattended-upgrades allows a finer configuration (for instance to also get an automatic installation of regular updates).

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