Ubuntu 21.10 is no longer getting updates – you should do that now

Warning: Canonical no longer provides updates for Ubuntu 21.10 “Impish Indri”. You should do that now.

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Ubuntu 21.10 Impish Indri is available for download
© Canonical
Update 15.6.:
On June 14, 2022, the support period for Ubuntu 21.10 ended. So you will no longer get updates for this Ubuntu version and security gaps will no longer be closed. You should therefore definitely upgrade to Ubuntu 22.04 LTS now: Ubuntu 22.04 LTS Jammy Jellyfish – Download and new features. After the upgrade, you have five years of peace, because that’s how long Canonical provides updates for Ubuntu 22.04.
update end
Ubuntu 21.04 (“Hirsute Hippo”, the “hairy hippopotamus”), which was released in the spring, has now been replaced by Ubuntu 21.10 as the latest Ubuntu version. Canonical announced this here. Ubuntu 21.10 is called Impish Indri. The English word “impish” means “impish” or “impish”. An “Indri” is a species of monkey, more precisely a species of lemur that lives on the island of Madagascar. So Ubuntu 21.10 is a mischievous lemur/monkey.
The main new features of Ubuntu 21.10 “Impish Indri” include: Kernel 5.13, Gnome 40, Firefox 92 (supplied as Snap by default), Libreoffice 7.2.1, Thunderbird 91.1.2 and nftables as the default backend for the firewall.
Canonical had already made the official wallpapers for Ubuntu 21.10 available for download as JPGs and PNGs in different resolutions some time ago. You can find wallpaper downloads here.
Danger:
Ubuntu 21.10 only gets nine months of support. Users who want to be provided with updates for a longer period of time without having to upgrade to a new Ubuntu version should therefore better install Ubuntu 20.04 LTS and remain loyal to it. The next new LTS version will then be Ubuntu 22.04 LTS, which will be released in April 2022. All LTS versions receive five years of support and, for a fee, even ten years of support (Extended Maintenance Release, ESM).
Ubuntu 21.10 Download and Release Notes
You can find the release notes, in which all new features are described, under this link.
Also on this link you will find the download of Ubuntu 21.10 Desktop, as well as the downloads of all the official derivatives of Ubuntu 21.10 such as the server and cloud versions, as well as Kubuntu, Lubuntu, Ubuntu Budgie, UbuntuKylin, Ubuntu Mate, Ubuntu Studio and Xubuntu.
Ubuntu 21.04 (Hirsute Hippo) has been released
Ubuntu 20.10 Groovy Gorilla is ready – and optimized for Raspberry Pi
Ubuntu 20.04 LTS Focal Fossa: Innovations, Release, Download
Ubuntu 19.10 Eoan Ermine: Innovations, Release, Download
Ubuntu 19.04 Disco Dingo: download and what’s new
Ubuntu 18.10 has been released – with Gnome 3.30 & Kernel 4.18
Bionic Beaver: Ubuntu 18.04.1 LTS is available
Ubuntu 17.10 Artful Aardvark is available
Ubuntu 17.04 Zesty Zapus: These are the innovations
There are these Ubuntu Linux variants: server, desktop, IoT