DistroWatch Weekly, Issue 659, 2 May 2016

Feature Story (by Joshua Allen Holm)

Ubuntu 16.04 LTS



It is always a big deal when Canonical releases a new long-term support version of Ubuntu. Despite Ubuntu's important place in the Linux distribution ecosystem, I should admit right off the bat that I am not a regular user of Ubuntu. I try out each new release of the desktop version Ubuntu and occasionally use Ubuntu Server, but I tend to use Fedora and CentOS for almost all of my daily desktop and server needs. Still, I've always been fascinated by what Canonical is doing with Ubuntu and their Unity desktop environment. Below, I take a look at Ubuntu 16.04 LTS and share my thoughts on the Unity desktop environment and the distribution as a whole.





Ubuntu 16.04 -- Running Unity from the live media

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After downloading the 1.4 GB ISO and copying it to a USB flash drive, I rebooted my computer and started Ubuntu 16.04 from the flash drive. I have to admit, I was extremely impressed by how quickly it started up. Even though I was using a fairly slow USB 2.0 drive, I had a fully working desktop ready to use in slightly less time than it takes for Fedora 23 to boot off the laptop's hard drive. The system was very responsive and used approximately 460MB of RAM with no applications running.





Ubuntu 16.04 -- Running virtual terminals

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Convinced that the distribution did not have any issues with my hardware, I installed Ubuntu 16.04 on my hard drive. The experience was exactly what I have come to expect from any distribution that uses the Ubiquity installer. The installation process is straight forward and easy to understand. There are a few tweaks to the installer compared to the version used in Ubuntu 15.10, but they are very minor.



What's New in Ubuntu 16.04 LTS



Ubuntu 16.04 is the sixth long-term release of the distribution, and like all of the previous LTS releases, tends to be fairly conservative in its changes. Beyond updated versions of applications and a newer Linux kernel (version 4.4), users of Ubuntu 15.10 will find only a few differences. In fact, most of the new features from the official announcement are server-focused technologies, though there are a few interesting new features for desktop users. Users upgrading from the previous LTS release will, of course, notice far more changes.



Many of the small changes are things that some people have been very vocal about on-line. The much reviled on-line search results in the dash feature now defaults to off instead of on. It is now possible to move the launcher from the left side of the screen to the bottom, but there is no setting to do so in the control panel. If you want to move the launcher, you will need to use Unity Tweak Tool or edit the setting directly using dconf. One other minor tweak is a setting to turn make it so that application menus are always visible instead of only being visible on mouse over.





Ubuntu 16.04 -- The Unity dash

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Beyond the little tweaks, Ubuntu 16.04 has a few other changes. Brasero (CD burning software) and Empathy (instant messaging software) are no longer installed by default. GNOME Calendar now serves as the default calendar application and is installed by default. One other interesting new addition is the inclusion of log off, restart, and shutdown in the dash's application search results. These entries allow the user to quickly perform that task just by searching for it. Of course, all the software has been updated to newer releases. Recent releases of Firefox, Thunderbird, and LibreOffice are included and plenty of other software is available in the repositories. Developers will find recent releases of many programming languages, including Python 3.5 and Go 1.6.





Ubuntu 16.04 -- Ubuntu Software

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Installing software is probably the most noticeable change in this new release of Ubuntu. The old Ubuntu Software Center has been replaced with Ubuntu Software, which is a re-branded version of GNOME Software. This change might take a little time to get used to for some people, but I found that Ubuntu Software performed much better than Ubuntu Software Center did in Ubuntu 15.10 on the same computer. An even bigger change than the transition to Ubuntu Software is the ability to install software using "snaps" instead of standard .deb packages. Snaps are basically containerize applications. While I found the command line interface for managing snaps easy to use, it is still too early to tell how significant the new feature will become.



The Unity Desktop



My preferred desktop environment is GNOME 3, so Unity is a somewhat familiar experience. With the application launcher on the left and a full screen interface for searching for applications, Unity is like GNOME 3's cousin. (Given the history of Unity's development, that is more than just an analogy.) There were plenty of similarities, but there were enough differences to make the experience interesting.



I tend to use GNOME 3 without any tweaks, unless I am using CentOS or Red Hat Enterprise Linux, where I use GNOME 3's Classic Mode, so I am accustomed to having to go into the Activities overview (or using keyboard shortcuts) to do most tasks. I do not mind this in the least, but having Unity's launcher always displayed was handy. It did take up a little screen real estate, but it was not too intrusive. Of course, there are options to hide and resize the launcher, so it can take up less space or only show when the cursor moves to left side of the screen. Given the massive amount of news coverage that the new, hidden, move the launcher to the bottom feature received in the lead up to the release of Ubuntu 16.04, I tried moving the launcher to the bottom, but I did not really like it. To each their own, but on a wide-screen display, I much prefer losing a little width instead of a little height.





Ubuntu 16.04 -- Exploring the Unity control panel

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While Unity does not have the plethora of customization options found in the GNOME 2 desktop Ubuntu used before developing Unity, I found the options available to be useful and a good balance between too many to the point of being overwhelming and too few. Sure there are only two colour themes (not counting high contrast), but Radiance and Ambience are both very nice looking. I slightly prefer Radiance, but either way, the themes help provide a unique Ubuntu experience and look-and-feel. The other options, like the choice to "Enable Workspaces" and "Add show desktop icon to the launcher" provide a nice option for customizing a user's workflow. A single screen might work for some, but others might want to use multiple desktops. Some people do not like Ubuntu's default setting being the simpler, single screen workflow, but I can understand the logic behind the decision.



The one thing I had a hard time adjusting to was having application menus at the top of the screen in the menu bar. I am sure I would get used to it if I used Ubuntu long term, but during my brief testing of Ubuntu 16.04 it was the one thing that really caused me to pause and very briefly think when I wanted to use the menus. Thankfully, there is the option to put the menus in the application's title bar and to make them always visible, so there are ways to change the default behaviour.



One other menu related issue that bothered me a little was the fact that Ubuntu's use of GNOME applications leads to somewhat inconsistent menus. GNOME uses a single application menu for most of its applications, and while Ubuntu has made an effort to change this behaviour back to the old style of File, Edit, etc. menus, this is not always done. Cheese, the webcam application, has a menu that is just labelled "Cheese". It is not a big deal, but it is an inconsistency. Hopefully as Ubuntu moves towards Unity 8 and convergence, new Ubuntu specific applications will emerge making the user experience even more cohesive.



Unity, just like my preferred GNOME 3 desktop environment, tends to be something users either love or hate (or love to hate). It does not feature the multitude of built-in window decoration and theming options that can be found in KDE, Xfce, and many of the other desktop environments. Unity has a limited set of options, but that limited set of options creates a consistent experience. I can understand that might not appeal to everyone, but I like it.



Final Thoughts



Ubuntu 16.04 is a very nice release. It will be supported until 2021, so it is an excellent choice for users looking for a desktop focused distribution with long term support. The constant update cycle on non-LTS Ubuntu releases and other distributions with short support windows can become tedious. Ubuntu 16.04 provides a nice remedy to constant distribution upgrades while still offering a pleasant and fully functional desktop experience. While I found Ubuntu 16.04 to be very stable, it seems like some others have not had the same experience. Cautious users might want to wait until Ubuntu 16.04.1 is released before upgrading from Ubuntu 15.10. Users of Ubuntu 14.04, the previous long term support release, will not even be prompted to upgrade until 16.04.1 is out, but now is a good time to check out the live media and see if it is worth it for them to make the upgrade. * * * * * Hardware used in this review



My physical test equipment for this review was an Acer TravelMate X483 laptop with the following specifications: Processor: Quad-core 1.5GHz Intel Core i3-2375M CPU

Storage: Seagate 500GB 5400 RPM hard drive

Memory: 4GB of RAM

Networking: Qualcomm Atheros AR9462 Wireless Network Adapter

Display: Intel HD Graphics 3000

Miscellaneous News (by Jesse Smith)

Linux Mint unveils new version of Cinnamon, Debian Wheezy gets long term support, Devuan releases beta, Sabayon supplies ARM images and NetBSD gains ASLR support



The Linux Mint team has announced the release of Cinnamon 3.0. The Cinnamon desktop environment is based on GTK 3 and offers a combination of modern conveniences with a traditional desktop layout. Some of the new features in Cinnamon 3.0 include " Window management improvements on tiling, mapping and unmapping windows, compositor's window groups and tracking of full screen windows. Improved out of the box touchpad support (edge-scrolling and two-finger-scrolling can now be configured independently and are both enabled by default). New accessibility and sound settings (both rewritten as native cinnamon-settings modules). Battery powered devices can be renamed. " The complete list of changes can be found in the project's blog post. Cinnamon 3.0 is likely to debut in the next major version of Linux Mint later this year. * * * * * The Debian project has announced that regular security support for Debian 7 "Wheezy" has reached its end. For people who wish to continue running Debian Wheezy, this version of Debian will be maintained by the Debian Long Term Support (LTS) Team. " As of 25 April, one year after the release of Debian 8, alias "Jessie", and nearly three years after the release of Debian 7, alias "Wheezy", regular security support for Wheezy comes to an end. The Debian Long Term Support (LTS) Team will take over security support. Information for users: Wheezy LTS will be supported from 26 April 2016 to 31 May 2018. For Debian 7 Wheezy LTS there will be no requirement to add a separate wheezy-lts suite to your sources.list any more and your current setup will continue to work without further changes. " Additional information on Debian Wheezy's transition from regular to LTS support can be found in the announcement.



The Devuan project, a fork of Debian which does not feature the systemd init software, has released its first beta. The new development release strives to supply a safe upgrade path from Debian Wheezy for people who wish to avoid installing systemd packages on their system. " Debian GNU+Linux is a fork of Debian without systemd, on its way to becoming much more than that. This Beta release marks an important milestone towards the sustainability and the continuation of Devuan as a universal base distribution. Today Devuan Jessie provides continuity as a safe upgrade path from Debian Wheezy and a flawless switch from Debian Jessie, avoiding most of the problems introduced by systemd. " The release announcement contains additional information and download links. * * * * * Ettore Di Giacinto has announced that the Sabayon project has released an ARM-based build of their distribution. The new ARM installation images are designed to run on Raspberry Pi computers, specifically version 2 and 3 of the Raspberry Pi single board computer. " We are glad to announce the immediate availability of Sabayon ARM (hfp) for Raspberry Pi 2 and 3. This is our first step towards ARM support, the package release scheduling will be different from our amd64 variant. Updates will be on a period of 6 months, except for security or special updates. The image comes out of the box with the latest 4.4.y kernel and with the rpi-update tool that can be used to update kernel and firmware. The username/password is sabayon:sabayon, and sudo is already set-up. Just flash the image with dd, and attach it to a network (it will get an IP automatically from your network). The OS is set to automatically boot and start eth0 and sshd (so you can connect to it via ssh). " Download links and additional information can be found on Sabayon's website. * * * * * Though it was introduced with little fanfare, the NetBSD operating system now includes support for address space layout randomization (ASLR), a feature which makes it difficult for attackers to guess the locations of data in memory. The feature was added by Christos Zoulas and enables the security feature on 64-bit x86 machines. The added security will make it harder for attackers to compromise applications running on the highly portable operating system. * * * * * These and other news stories can be found on our Headlines page.





Questions and Answers (by Jesse Smith)

Compiling a custom kernel for performance gains



Feeling-the-need-for-speed asks: I want to dive in and compile my own kernel. If I rip out unnecessary drivers and other things I don't need, what kind of performance gains can I get? Are there specific compiler settings that will improve my custom kernel's performance over the default one my distribution provides?



DistroWatch answers: Building a custom kernel that does not include driver modules you will not be needing will reduce the size of your kernel, but it is unlikely to give you a performance gain. At least not a noticeable one. Drivers the kernel does not use will not be run and therefore will not impact performance.



If you want to improve the performance of your kernel you might be better off enabling the BFS process scheduler, which has been shown to improve desktop responsiveness when compared against the stock CFS scheduler.



As for changing compiler settings, I recommend against trying to switch compilers or change the default compiler flags. The Linux kernel is a complex piece of software and is pretty closely tied to the GNU C compiler. Changing compiler flags on such a large and complex code base is as likely to cause problems as boost performance.



My suggestion, if you want more speed, is to look at things you can change outside of the kernel. For instance, using a lighter desktop environment (such as LXDE) will free up resources and possibly result in a more responsive desktop. Disabling background services you do not need, such as file indexing, will free up some memory and might make your system faster. Assuming your computer has a lot of memory, you might look at decreasing your system's swappiness level in an effort to avoid accessing slow swap space. Again, assuming your computer has lots of RAM, running a service such as preload can keep more of your applications in memory, reducing load time. * * * * * Past Questions and Answers columns can be found in our Q&A Archive.

Torrent Corner

Weekly Torrents



Bittorrent is a great way to transfer large files, particularly open source operating system images, from one place to another. Most bittorrent clients recover from dropped connections automatically, check the integrity of files and can re-download corrupted bits of data without starting a download over from scratch. These characteristics make bittorrent well suited for distributing open source operating systems, particularly to regions where Internet connections are slow or unstable.



Many Linux and BSD projects offer bittorrent as a download option, partly for the reasons listed above and partly because bittorrent's peer-to-peer nature takes some of the strain off the project's servers. However, some projects do not offer bittorrent as a download option. There can be several reasons for excluding bittorrent as an option. Some projects do not have enough time or volunteers, some may be restricted by their web host provider's terms of service. Whatever the reason, the lack of a bittorrent option puts more strain on a distribution's bandwidth and may prevent some people from downloading their preferred open source operating system.



With this in mind, DistroWatch plans to give back to the open source community by hosting and seeding bittorrent files. For now, we are hosting a small number of distribution torrents, listed below. The list of torrents offered will be updated each week and we invite readers to e-mail us with suggestions as to which distributions we should be hosting. When you message us, please place the word "Torrent" in the subject line, make sure to include a link to the ISO file you want us to seed. To help us maintain and grow this free service, please consider making a donation.



The table below provides a list of torrents we currently host. If you do not currently have a bittorrent client capable of handling the linked files, we suggest installing either the Transmission or KTorrent bittorrent clients.



Operating System Torrent MD5 checksum Sabayon 16.05 Sabayon_Linux_16.05_amd64_KDE.iso 5b91d656d33f247188bfecb7865be40f Slackel 6.0.5 "Openbox" slackellive64-openbox-6.0.5.iso e4c915d56434ceb4acbd676d68ae8da0 Tails 2.3 tails-i386-2.3/tails-i386-2.3.iso.sig d3b024a6e4e60eab86c589a9900db0fc



Archives of our previously seeded torrents may be found here. All torrents we make available here are also listed on the very useful Linux Tracker website. Thanks to Linux Tracker we are able to share the following torrent statistics.



Torrent Corner statistics:

Total torrents seeded: 190

Total data uploaded: 35.2TB

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Opinion Poll

Compiling your own kernel



The kernel is a core component of any operating system. It is the part of the system which communicates with the computer's hardware. The kernel is also responsible for loading programs, scheduling tasks and enforcing low-level security.



There are all sorts of reasons someone might compile their own, custom copy of the kernel. Some people do it for the educational experience, others do it to add features, some try to make their kernel as small and efficient as possible. Of course kernel developers compile their kernel as part of their job.



This week we would like to know if you compile your operating system's kernel and, if so, why? Are you doing it for work, fun, education or another reason?



You can see the results of our previous poll on using HTTPS here. All previous poll results can be found in our poll archives. Compiling your own kernel



I compile my kernel for the educational experience: 160 (8%) I compile my kernel as part of my job: 32 (2%) I run a source-based distribution: 107 (6%) I added/removed features in my custom kernel: 131 (7%) I enjoy it/it is fun: 93 (5%) I do not compile my kernel: 1379 (73%)

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