Ubuntu is an open source operating system or operating system, built from the Linux kernel, based on Debian and using GNOME as the desktop environment of its latest version with long-term support. It is developed by Canonical Ltd. Wikipedia

Ubuntu Linux 21.10 Impish Indri

This is the next intermediate release of Ubuntu.

The release is scheduled for October 14, 2021, following the Ubuntu 21.10 development schedule

1 April 29 Toolchain Uploaded
10 July 01 Ubuntu Testing Week (optional)
17 August 19, Feature Freeze 63, Debian Import Freeze
18 August 26 Ubuntu Testing Week (optional)
20 September 09 User Interface Freeze 25
21 September 16 Documentation String Freeze 2, Kernel Feature Freeze 10
22 September 20 (Monday) Beta Freeze, Hardware Enablement Freeze 7
⠀ September 23 Beta (mandatory)
23 September 30 Kernel Freeze 19, Non Language Pack Translation Deadline 2
October 2021
24 October 07 Final Freeze 8, Release Candidate 4, Language Pack Translation Deadline 3
25 October 14 Final Release 28

Source

What’s New in Ubuntu Linux 21.10 Impish Indri