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I've been using Debian Stable for 1 year. I like Debian for their Privacy Policy, no telemetry and security.
Now I need to reinstall my distro and I want to go for security distro. I don't know whether I should go for Debian Stable or Testing.

The reason I want to switch to Testing is newer kernels (they are more secure) because I sometimes fail when I try to compile a newer kernel or it takes too much time to compile and I think Testing is getting faster and includes newer security updates and packages such as apparmor and others.

closed as primarily opinion-based by roaima, Christopher, RalfFriedl, GAD3R, Jeff Schaller Jan 29 at 1:12

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    If you have to ask, go for Stable. – Rui F Ribeiro Jan 28 at 13:20
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If your two main criteria are security support and updated kernels, I recommend installing Debian 9 (stable) and using the backported kernels — kernels which enter testing are regularly backported to stable. If you run Debian testing you need to keep an eye on security updates yourself; barring exceptional circumstances they are only pushed to unstable, and migrate to testing following the testing rules (see the Debian wiki for details), which means that in some cases they can take a while to become available. Paradoxically, as the Debian 10 release gets closer and the freeze comes into effect, this will become more of a problem (but the freeze is one of the circumstances in which security fixes are more likely to be pushed to testing explicitly).

To install such a kernel, add backports to the available repositories:

echo deb http://deb.debian.org/debian stretch-backports main | sudo tee /etc/apt/sources.list.d/stretch-backports.list

then update your package indexes:

sudo apt update

and install the latest backported kernel (here, for amd64)

sudo apt install -t stretch-backports linux-image-amd64

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