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The actual definition of a security upgrade (as used by unattended-upgrades, the package which does automated security upgrades) is this "${distro_id}:${distro_codename}-security"; (from /etc/apt/apt.conf.d/50unattended-upgrades) So, to create a security upgrade, you need to set up your own repository, and add the following line to /etc/apt/sources.list ...


If you find vulnerability(bug in Ubuntu) and make a patch for it(repair it), they are like writing software. But you should submit them to the Ubuntu team, with the vulnerability. I hope that you understand me.

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