grammar and syntax, after a ping by nacc on IRC to review the PHP 7.0 section.
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|* HUD hotkey default binding changes from alt to alt-space. The default window controls change to alt-semicolon. This should help with issues around key interception in virtualized desktops and games.||* HUD hotkey default binding changes from alt to alt-space. The default window controls change to alt-super. This should help with issues around key interception in virtualized desktops and games.|
Table of Contents
These release notes for Ubuntu 16.04 LTS (Xenial Xerus) provide an overview of the release and document the known issues with Ubuntu 16.04 LTS and its flavors.
Official flavour release notes
Find the links to release notes for official flavors here.
Get Ubuntu 16.04 LTS
Download Ubuntu 16.04 LTS
Images can be downloaded from a location near you.
You can download ISOs from:
http://releases.ubuntu.com/16.04/ (Ubuntu Desktop, Server, and Snappy Core)
http://cdimage.ubuntu.com/ubuntu/releases/16.04/beta-2/ (Less Popular Ubuntu Images)
http://cloud-images.ubuntu.com/releases/16.04/beta-2/ (Ubuntu Cloud Server)
http://cdimage.ubuntu.com/netboot/16.04/ (Ubuntu Netboot)
http://cdimage.ubuntu.com/ubuntustudio/releases/16.04/beta-2/ (Ubuntu Studio)
http://cdimage.ubuntu.com/ubuntu-gnome/releases/16.04/beta-2/ (Ubuntu GNOME)
http://cdimage.ubuntu.com/ubuntukylin/releases/16.04/beta-2/ (Ubuntu Kylin)
http://cdimage.ubuntu.com/ubuntu-mate/releases/16.04/beta-2/ (Ubuntu MATE)
Upgrading from Ubuntu 14.04 LTS or 15.10
To upgrade on a desktop system:
Open the "Software & Updates" Setting in System Settings.
- Select the 3rd Tab called "Updates".
- Set the "Notify me of a new Ubuntu version" dropdown menu to "For any new version" if you are using 15.10, set it to "long-term support versions" if you are using 14.04 LTS.
- Press Alt+F2 and type in "update-manager" (without the quotes) into the command box.
- Update Manager should open up and tell you: New distribution release '16.04 LTS' is available.
- Click Upgrade and follow the on-screen instructions.
To upgrade on a server system:
Install the update-manager-core package if it is not already installed.
- Make sure the /etc/update-manager/release-upgrades is set to normal if you are using 15.10, lts if you are using 14.04 LTS.
Launch the upgrade tool with the command sudo do-release-upgrade.
- Follow the on-screen instructions.
Note that the server upgrade will use GNU screen and automatically re-attach in case of dropped connection problems.
There are no offline upgrade options for Ubuntu Desktop and Ubuntu Server. Please ensure you have network connectivity to one of the official mirrors or to a locally accessible mirror and follow the instructions above.
New features in 16.04 LTS
As with every new release, packages--applications and software of all kinds--are being updated at a rapid pace. Many of these packages came from an automatic sync from Debian's unstable branch; others have been explicitly pulled in for Ubuntu 16.04.
For a list of all packages being accepted for Ubuntu 16.04, please subscribe to xenial-changes.
Linux kernel 4.4
Ubuntu 16.04 LTS is based on the long-term supported Linux release series 4.4.
Python has been upgraded to the 3.5 series.
If you have your own programs based on Python 2, fear not! Python 2 will continue to be available (as the python package) for the foreseeable future. However, to best support future versions of Ubuntu you should consider porting your code to Python 3. Python/3 has some advice and resources on this.
VIM defaults to python3
The default VIM package has been built against python3 instead of python2. This means plugins that require a python2 interpreter support from VIM will not work anymore. For this case alternative VIM packages are available that still use python2, for example vim-gnome-py2. They can be made the default via the alternatives mechanism:
sudo update-alternatives --set vim /usr/bin/vim.gnome-py2
golang toolchain was upgraded to the 1.6 series, and gcc-go was upgraded to the GCC6 branch. Thus the same level of standard library and compiler features are provided by both compilers on all fully supported architectures.
Recent OpenSSH releases disable several pieces of weak, legacy, and/or unsafe cryptography. If you are upgrading a system remotely over SSH, you should check that you are not relying on these to ensure that you will retain access after the upgrade.
Support for the legacy SSH version 1 protocol is disabled by default at compile time. Note that this also means that the Cipher keyword in ssh_config(5) is effectively no longer usable; use Ciphers instead for protocol 2. The openssh-client-ssh1 package includes "ssh1", "scp1", and "ssh-keygen1" binaries which you can use if you have no alternative way to connect to an outdated SSH1-only server; please contact the server administrator or system vendor in such cases and ask them to upgrade.
Support for the 1024-bit diffie-hellman-group1-sha1 key exchange is disabled by default at run-time. It may be re-enabled using the upstream instructions.
Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled by default at run-time. These may be re-enabled using the upstream instructions.
Support for the legacy v00 cert format has been removed.
Several ciphers are disabled by default in ssh: blowfish-cbc, cast128-cbc, all arcfour variants and the rijndael-cbc aliases for AES.
MD5-based and truncated HMAC algorithms are disabled by default in ssh.
docker was upgraded to the version 1.10. Note that this requires migration of existing images to a new format which will be performed on the first start of the service. This migration can take a long time and put a high load on the system, see https://docs.docker.com/engine/migration/ for more information.
PHP was upgraded to 7.0. Note that this will require modifications to custom PHP extensions (https://wiki.php.net/phpng-upgrading) and may require modifications to PHP source code (http://php.net/manual/en/migration70.php).
- NGINX and PHP 7.0
Upgrading from prior version of Ubuntu with PHP5 FPM configurations and NGINX will require a manual configuration change (http://dark-net.net/?p=125).
Ubuntu for IBM LinuxONE
Ubuntu 16.04 LTS includes a new port to 64-bit z/Architecture for IBM mainframe computers. This is a practically complete port of Ubuntu Server and Cloud with circa 95% binary package availability. We are excited to enable OpenStack software, Juju, MAAS, LXD, and much more on this platform.
The general theme for 16.04 on the desktop is one of bug fixes and incremental quality improvements ...
- GNOME is mostly upgraded to 3.18. GLib upgraded to to 2.48 (corresponding to GNOME 3.20)
- GNOME Software replaces Ubuntu Software Center. This brings a faster store experience and moves our archive metadata in line with Debian.
All default applications and libraries ported to use WebKit 2
- GNOME Calendar is now included by default
- Empathy and Brasero are removed from the default installation
- Chromium upgraded to version 48
- Firefox upgraded to version 45
- Online searches in the dash are now disabled by default
- Improved HiDPI support in the greeter
Added more supported languages by default More info
- Multiple bug fixes
- HUD hotkey default binding changes from alt to alt-space. The default window controls change to alt-super. This should help with issues around key interception in virtualized desktops and games.
Unity & Compiz
- Improved launcher integrates with file manager and devices
- Support for formatting removable devices from quicklist
- Improved support for gtk applications using headerbars
- Improvements to the switcher and spread backends
- Activate app spread by Super+Ctrl+W
- Unity control center option to always show menus
- Improvements to GNOME key grabbing
- New dash overlay scrollbars
- Better Dash theming support
- Support for scaling cursors in HiDPI environments
- Show icons launching state in launcher when apps launched elsewhere
- Launcher can be moved to the bottom
LibreOffice 5.1 brings a lot of improvements to entire package. For more information on these improvements please see the LibreOffice release notes available here. You can see a video highlighting some of the new features here.
LibreOffice defaults to the Breeze theme in Ubuntu
Improvements in the Python scripting and language bindings http://conference.libreoffice.org/assets/Conference/Aarhus/Slides/MatthewFrancisPyUNO.pdf
- Support for WebDAV via HTTPS
Writer word processor
- Added support for whitespace hiding. A long standing feature request.
Mailmerge in Writer can use spreadsheets as a data source http://vmiklos.hu/blog/mail-merge-embedding.html
- Spell check dialogue no longer auto closes
- Exponential and power trend lines handle negative Y values
- Performance improvements leveraging SSE3 for SUM functions
- Added support for PNG export
- Search for numbers as formatted/displayed
- Slide transitions use OpenGL 2.1+ and new transitions added
- Keyboard shortcuts for navigation and sorting
- Screensaver inhibiting for KDE, XFCE, Mate
As is to be expected, with any release, there are some significant known bugs that users may run into with this release of Ubuntu 16.04. The ones we know about at this point (and some of the workarounds), are documented here so you don't need to spend time reporting these bugs again:
Boot, installation and post-install
Errors about swap partition at install
There is a known issue regarding the creation of swap space during the install. In some cases the install will display the error message "Creation of swap space in Partition #n .... failed.". Please see this bug for more information. You may work around the issue by manually partitioning the disk and removing any existing swap partitions before then creating a new one.
Graphics and Display
The fglrx driver is now deprecated in 16.04, and we recommend its open source alternatives (radeon and amdgpu). AMD put a lot of work into the drivers, and we backported kernel code from Linux 4.5 to provide a better experience.
When upgrading to Ubuntu 16.04 from a previous release, both the fglrx driver and the xorg.conf will be removed, so that the system is set to use either the amdgpu driver or the radeon driver (depending on the available hardware).
More information is available here https://tjaalton.wordpress.com/2016/03/11/no-catalystfglrx-video-driver-in-ubuntu-16-04/
The release notes for the official flavours can be found at the following links:
Your comments, bug reports, patches and suggestions will help fix bugs and improve the quality of future releases. Please report bugs using the tools provided.
If you want to help out with bugs, the Bug Squad is always looking for help.
Participate in Ubuntu
If you would like to help shape Ubuntu, take a look at the list of ways you can participate at
More about Ubuntu
To sign up for future Ubuntu development announcements, please subscribe to Ubuntu's development announcement list at: