Fedora 26 will reach EOL (end-of-life) on 2018-05-29, and Debian 8 (“Jessie” full, not LTS) will reach EOL on 2018-06-06. We strongly recommend that all Qubes users upgrade their Fedora 26 TemplateVMs and StandaloneVMs to Fedora 27 or higher by 2018-06-01. Debian 8 users may choose to rely on Debian 8 LTS updates until approximately 2020-06-06 or upgrade to Debian 9 at their discretion. We provide step-by-step upgrade instructions for upgrading from Fedora 26 to 27, Fedora 27 to 28, and Debian 8 to 9. For a complete list of TemplateVM versions supported for your specific version of Qubes, see Supported TemplateVM Versions.
We also provide fresh Fedora 27, Fedora 28, and Debian 9 TemplateVM packages through the official Qubes repositories, which you can install in dom0 by following the standard installation instructions for Fedora and Debian TemplateVMs.
After upgrading your TemplateVMs, please remember to set all qubes that were using the old template to use the new one. The instructions to do this can be found in the upgrade instructions for Fedora 26 to 27, Fedora 27 to 28, and Debian 8 to 9.
Please note that no user action is required regarding the OS version in dom0. If you’re using Qubes 3.2 or 4.0, there is no dom0 OS upgrade available, since none is currently required. For details, please see our Note on dom0 and EOL.
If you’re using an older version of Qubes than 3.2, we strongly recommend that you upgrade to 3.2, as older versions are no longer supported.