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---
lang: en
layout: doc
permalink: /doc/releases/4.0/release-notes/
ref: 23
title: Qubes R4.0 release notes
---
New features since 3.2
----------------------
* Core management scripts rewrite with better structure and extensibility, [current API documentation](https://dev.qubes-os.org/projects/core-admin/en/latest/) and the documentation API index as a [webarchive](https://web.archive.org/web/20230128102821/https://dev.qubes-os.org/projects/qubes-core-admin/en/latest/)
* [Admin API](/news/2017/06/27/qubes-admin-api/) allowing strictly controlled managing from non-dom0
* All `qvm-*` command-line tools rewritten, some options have changed
* Renaming VM directly is prohibited, there is GUI to clone under new name and remove old VM
* Use [PVH](https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt) and [HVM](https://github.com/QubesOS/qubes-issues/issues/2185) by default to [mitigate Meltdown & Spectre](https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt) and lower the [attack surface on Xen](https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-024-2016.txt)
* Create USB VM by default
* [Multiple DisposableVMs templates support](https://github.com/QubesOS/qubes-issues/issues/2253)
* New [backup format](/doc/backup-emergency-restore-v4/) using scrypt key-derivation function
* Non-encrypted backups no longer supported
* [split VM packages](https://github.com/QubesOS/qubes-issues/issues/2771), for better support minimal, specialized templates
* [Qubes Manager decomposition](https://github.com/QubesOS/qubes-issues/issues/2132) - domains and devices widgets instead of full Qubes Manager; devices widget support also USB
* [More flexible firewall interface](/doc/vm-interface/) for ease unikernel integration
* Template VMs do not have network interface by default, [qrexec-based updates proxy](https://github.com/QubesOS/qubes-issues/issues/1854) is used instead
* More flexible IP addressing for VMs - [custom IP](https://github.com/QubesOS/qubes-issues/issues/1477), [hidden from the IP](https://github.com/QubesOS/qubes-issues/issues/1143)
* More flexible Qubes RPC policy - [related ticket](https://github.com/QubesOS/qubes-issues/issues/865), [documentation](/doc/qrexec/#specifying-vms-tags-types-targets-etc)
* [New Qubes RPC confirmation window](https://github.com/QubesOS/qubes-issues/issues/910), including option to specify destination VM
* [New storage subsystem design](https://github.com/QubesOS/qubes-issues/issues/1842)
* Dom0 update to Fedora 25 for better hardware support
* Kernel 4.9.x
You can get detailed description in [completed github issues](https://github.com/QubesOS/qubes-issues/issues?q=is%3Aissue+sort%3Aupdated-desc+milestone%3A%22Release+4.0%22+label%3Arelease-notes+is%3Aclosed)
Security Notes
--------------
* PV VMs migrated from 3.2 to 4.0-rc4 or later are automatically set to PVH mode in order to protect against Meltdown (see [QSB #37](https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt)).
However, PV VMs migrated from any earlier 4.0 release candidate (RC1, RC2, or RC3) are not automatically set to PVH mode.
These must be set manually.
* The following steps may need to be applied in dom0 and Fedora 26 TemplateVMs in order to receive updates (see [#3737](https://github.com/QubesOS/qubes-issues/issues/3737)).
Steps for dom0 updates:
1. Open the Qubes Menu by clicking on the "Q" icon in the top-left corner of the screen.
2. Select `Terminal Emulator`.
3. In the window that opens, enter this command:
```
sudo nano /etc/yum.repos.d/qubes-dom0.repo
```
4. This opens the nano text editor. Change all four instances of `http` to `https`.
5. Press `CTRL+X`, then `Y`, then `ENTER` to save changes and exit.
6. Check for updates normally.
Steps for Fedora 26 TemplateVM updates:
1. Open the Qubes Menu by clicking on the "Q" icon in the top-left corner of the screen.
2. Select `Template: fedora-26`, then `fedora-26: Terminal`.
3. In the window that opens, enter the command for your version:
```
[Qubes 3.2] sudo gedit /etc/yum.repos.d/qubes-r3.repo
[Qubes 4.0] sudo gedit /etc/yum.repos.d/qubes-r4.repo
```
4. This opens the gedit text editor in a window. Change all four instances of `http` to `https`.
5. Click the "Save" button in the top-right corner of the window.
6. Close the window.
7. Check for updates normally.
8. Shut down the TemplateVM.
Known issues
------------
* Locale using coma as decimal separator [crashes qubesd](https://github.com/QubesOS/qubes-issues/issues/3753). Either install with different locale (English (United States) for example), or manually apply fix explained in that issue.
* In the middle of installation, [keyboard layout reset to US](https://github.com/QubesOS/qubes-issues/issues/3352). Be careful what is the current layout while setting default user password (see upper right screen corner).
* On some laptops (for example Librem 15v2), touchpad do not work directly after installation. Reboot the system to fix the issue.
* List of USB devices may contain device identifiers instead of name
* With R4.0.1, which ships kernel-4.19, you may never reach the anaconda startup and be block on an idle black screen with blinking cursor. You can try to add `plymouth.ignore-serial-consoles` in the grub installer boot menu right after `quiet rhgb`. With legacy mode, you can do it directly when booting the DVD or USB key. In UEFI mode, follow the same procedure described for [disabling](/doc/uefi-troubleshooting/#installation-freezes-before-displaying-installer) `nouveau` module (related [solved issue](https://github.com/QubesOS/qubes-issues/issues/3849) in further version of Qubes).
* For other known issues take a look at [our tickets](https://github.com/QubesOS/qubes-issues/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Release+4.0%22+label%3Abug)
It is advised to install updates just after system installation to apply bug fixes for (some of) the above problems.
Downloads
---------
See [Qubes Downloads](/downloads/).
Installation instructions
-------------------------
See [Installation Guide](/doc/installation-guide/).
Upgrading
---------
There is no in-place upgrade path from earlier Qubes versions. The only
supported option to upgrade to Qubes R4.0 is to install it from scratch and use
[qubes backup and restore tools](/doc/backup-restore/) for migrating of all of the user VMs.
We also provide [detailed instruction](/doc/upgrade-to-r4.0/) for this procedure.

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========================
Qubes R4.0 release notes
========================
New features since 3.2
----------------------
- Core management scripts rewrite with better structure and extensibility, `current API documentation <https://dev.qubes-os.org/projects/core-admin/en/latest/>`__ and the documentation API index as a `webarchive <https://web.archive.org/web/20230128102821/https://dev.qubes-os.org/projects/qubes-core-admin/en/latest/>`__
- `Admin API <https://www.qubes-os.org/news/2017/06/27/qubes-admin-api/>`__ allowing strictly controlled managing from non-dom0
- All ``qvm-*`` command-line tools rewritten, some options have changed
- Renaming VM directly is prohibited, there is GUI to clone under new name and remove old VM
- Use `PVH <https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt>`__ and `HVM <https://github.com/QubesOS/qubes-issues/issues/2185>`__ by default to `mitigate Meltdown & Spectre <https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt>`__ and lower the `attack surface on Xen <https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-024-2016.txt>`__
- Create USB VM by default
- `Multiple DisposableVMs templates support <https://github.com/QubesOS/qubes-issues/issues/2253>`__
- New :doc:`backup format </user/how-to-guides/backup-emergency-restore-v4>` using scrypt key-derivation function
- Non-encrypted backups no longer supported
- `split VM packages <https://github.com/QubesOS/qubes-issues/issues/2771>`__, for better support minimal, specialized templates
- `Qubes Manager decomposition <https://github.com/QubesOS/qubes-issues/issues/2132>`__ - domains and devices widgets instead of full Qubes Manager; devices widget support also USB
- :doc:`More flexible firewall interface </developer/debugging/vm-interface>` for ease unikernel integration
- Template VMs do not have network interface by default, `qrexec-based updates proxy <https://github.com/QubesOS/qubes-issues/issues/1854>`__ is used instead
- More flexible IP addressing for VMs - `custom IP <https://github.com/QubesOS/qubes-issues/issues/1477>`__, `hidden from the IP <https://github.com/QubesOS/qubes-issues/issues/1143>`__
- More flexible Qubes RPC policy - `related ticket <https://github.com/QubesOS/qubes-issues/issues/865>`__, :ref:`documentation <developer/services/qrexec:specifying vms: tags, types, targets, etc.>`
- `New Qubes RPC confirmation window <https://github.com/QubesOS/qubes-issues/issues/910>`__, including option to specify destination VM
- `New storage subsystem design <https://github.com/QubesOS/qubes-issues/issues/1842>`__
- Dom0 update to Fedora 25 for better hardware support
- Kernel 4.9.x
You can get detailed description in `completed github issues <https://github.com/QubesOS/qubes-issues/issues?q=is%3Aissue+sort%3Aupdated-desc+milestone%3A%22Release+4.0%22+label%3Arelease-notes+is%3Aclosed>`__
Security Notes
--------------
- PV VMs migrated from 3.2 to 4.0-rc4 or later are automatically set to PVH mode in order to protect against Meltdown (see `QSB #37 <https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-037-2018.txt>`__). However, PV VMs migrated from any earlier 4.0 release candidate (RC1, RC2, or RC3) are not automatically set to PVH mode. These must be set manually.
- The following steps may need to be applied in dom0 and Fedora 26 TemplateVMs in order to receive updates (see `#3737 <https://github.com/QubesOS/qubes-issues/issues/3737>`__).
Steps for dom0 updates:
1. Open the Qubes Menu by clicking on the “Q” icon in the top-left corner of the screen.
2. Select ``Terminal Emulator``.
3. In the window that opens, enter this command:
.. code:: bash
sudo nano /etc/yum.repos.d/qubes-dom0.repo
4. This opens the nano text editor. Change all four instances of ``http`` to ``https``.
5. Press ``CTRL+X``, then ``Y``, then ``ENTER`` to save changes and exit.
6. Check for updates normally.
Steps for Fedora 26 TemplateVM updates:
1. Open the Qubes Menu by clicking on the “Q” icon in the top-left corner of the screen.
2. Select ``Template: fedora-26``, then ``fedora-26: Terminal``.
3. In the window that opens, enter the command for your version:
.. code:: bash
[Qubes 3.2] sudo gedit /etc/yum.repos.d/qubes-r3.repo
[Qubes 4.0] sudo gedit /etc/yum.repos.d/qubes-r4.repo
4. This opens the gedit text editor in a window. Change all four instances of ``http`` to ``https``.
5. Click the “Save” button in the top-right corner of the window.
6. Close the window.
7. Check for updates normally.
8. Shut down the TemplateVM.
Known issues
------------
- Locale using coma as decimal separator `crashes qubesd <https://github.com/QubesOS/qubes-issues/issues/3753>`__. Either install with different locale (English (United States) for example), or manually apply fix explained in that issue.
- In the middle of installation, `keyboard layout reset to US <https://github.com/QubesOS/qubes-issues/issues/3352>`__. Be careful what is the current layout while setting default user password (see upper right screen corner).
- On some laptops (for example Librem 15v2), touchpad do not work directly after installation. Reboot the system to fix the issue.
- List of USB devices may contain device identifiers instead of name
- With R4.0.1, which ships kernel-4.19, you may never reach the anaconda startup and be block on an idle black screen with blinking cursor. You can try to add ``plymouth.ignore-serial-consoles`` in the grub installer boot menu right after ``quiet rhgb``. With legacy mode, you can do it directly when booting the DVD or USB key. In UEFI mode, follow the same procedure described for :ref:`disabling <user/troubleshooting/uefi-troubleshooting:installation freezes before displaying installer>` ``nouveau`` module (related `solved issue <https://github.com/QubesOS/qubes-issues/issues/3849>`__ in further version of Qubes).
- For other known issues take a look at `our tickets <https://github.com/QubesOS/qubes-issues/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Release+4.0%22+label%3Abug>`__
It is advised to install updates just after system installation to apply bug fixes for (some of) the above problems.
Downloads
---------
See `Qubes Downloads <https://www.qubes-os.org/downloads/>`__.
Installation instructions
-------------------------
See :doc:`Installation Guide </user/downloading-installing-upgrading/installation-guide>`.
Upgrading
---------
There is no in-place upgrade path from earlier Qubes versions. The only supported option to upgrade to Qubes R4.0 is to install it from scratch and use :doc:`qubes backup and restore tools </user/how-to-guides/how-to-back-up-restore-and-migrate>` for migrating of all of the user VMs. We also provide :doc:`detailed instruction </user/downloading-installing-upgrading/upgrade/4_0>` for this procedure.

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---
lang: en
layout: doc
permalink: /doc/releases/4.0/schedule/
redirect_from:
- /en/doc/releases/4.0/schedule/
ref: 24
title: Qubes R4.0 release schedule
---
This schedule is based on [Version Scheme](/doc/version-scheme/#release-schedule).
| Date | Stage |
| -----------:| --------------------------------------- |
| 31 Jul 2017 | 4.0-rc1 release |
| ~~28 Aug 2017~~ <br/>~~11 Sep 2017~~ <br/>~~9 Oct 2017~~ <br/>18 Oct 2017 | current-testing freeze before 4.0-rc2 |
| ~~4 Sep 2017~~ <br/> ~~18 Sep 2017~~ <br/>~~16 Oct 2017~~ <br/>23 Oct 2017 | 4.0-rc2 release |
| 6 Nov 2017 | decide whether 4.0-rc2 is the final 4
| 20 Nov 2017 | current-testing freeze before 4.0-rc3 |
| 27 Nov 2017 | 4.0-rc3 release |
| 11 Dec 2017 | decide whether 4.0-rc3 is the final 4.0 |
| 1 Jan 2018 | current-testing freeze before 4.0-rc4 |
| ~~8 Jan 2018~~ <br/>31 Jan 2018 | 4.0-rc4 release |
| ~~22 Jan 2018~~ <br/>14 Feb 2018 | decide whether 4.0-rc4 is the final 4.0 |
| 27 Feb 2018 | current-testing freeze before 4.0-rc5 |
| 6 Mar 2018 | 4.0-rc5 release |
| 20 Mar 2018 | decide whether 4.0-rc5 is the final 4.0 |
| 28 Mar 2018 | final 4.0 release |

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===========================
Qubes R4.0 release schedule
===========================
This schedule is based on :ref:`Version Scheme <developer/releases/version-scheme:release schedule>`.
.. list-table::
:widths: 88 88
:align: center
:header-rows: 1
* - Date
- Stage
* - 31 Jul 2017
- 4.0-rc1 release
* - :strike:`28 Aug 2017` :strike:`11 Sep 2017` :strike:`9 Oct 2017` 18 Oct 2017
- current-testing freeze before 4.0-rc2
* - :strike:`4 Sep 2017` :strike:`18 Sep 2017` :strike:`16 Oct 2017` 23 Oct 2017
- 4.0-rc2 release
* - 6 Nov 2017
- decide whether 4.0-rc2 is the final 4
* - 20 Nov 2017
- current-testing freeze before 4.0-rc3
* - 27 Nov 2017
- 4.0-rc3 release
* - 11 Dec 2017
- decide whether 4.0-rc3 is the final 4.0
* - 1 Jan 2018
- current-testing freeze before 4.0-rc4
* - :strike:`8 Jan 2018` 31 Jan 2018
- 4.0-rc4 release
* - :strike:`22 Jan 2018` 14 Feb 2018
- decide whether 4.0-rc4 is the final 4.0
* - 27 Feb 2018
- current-testing freeze before 4.0-rc5
* - 6 Mar 2018
- 4.0-rc5 release
* - 20 Mar 2018
- decide whether 4.0-rc5 is the final 4.0
* - 28 Mar 2018
- final 4.0 release