Debian 9.13 is now available for download as the latest update to version 9, also known as Stretch. As always, changelog reports software enhancements and security fixes.
Needless to say, this is one point release and team of Debian emphasizes that this is the final (last) update of the 9 series, which means you should upgrade to Debian 10 as soon as possible.
"After this release, the Debian Security and Release Teams will no longer develop updates for Debian 9. Users who wish to continue to receive security updates they should upgrade to Debian 10 or refer to https://wiki.debian.org/LTS for details on the subset of architectures and packages covered by Long Term Support project", αναφέρει η ομάδα ανάπτυξης.
The new version includes major bug fixes and security enhancements, such as patches for memory corruption issues and memory leaks. It also resolves login errors in TLS 1.2 that some users have encountered while trying to connect to specific hosting providers.
From here you can see the whole changelog.
As for the updated software, there are new versions of the Firefox, Thunderbird and all the other packages that come with Debian. Those who update their devices on a regular basis will already be using some of the updated apps.
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ISO - Live DVD