Debian has always been very cautious/deliberate very stable and very trustworthy, and it’s comparably easy to use for the security it provides.

Is Debian Linux secure?

One of Debian’s main advantages with regards to security is the ease of system updates through the use of apt . Here are some other aspects of security in Debian to consider: Debian provides more security tools than other distributions, see Chapter 8, Security tools in Debian.

Is Debian unstable safe?

Unstable is simply more current than testing and is not impacted by e.g.the current freeze until buster is released. That said, there are many people using sid. Simply be prepared to have some broken packages from time to time. Debian Stable is both much more stable and reliable than Sid.