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According to Raspberry Pi
It’s now just under two years since we released the Jessie version of Raspbian. Those of you who know that Debian run their releases on a two-year cycle will therefore have been wondering when we might be releasing the next version, codenamed Stretch. Well, wonder no longer – Raspbian Stretch is available for download today!
The differences between Jessie and Stretch are mostly under-the-hood optimisations, and you really shouldn’t notice any differences in day-to-day use of the desktop and applications. (If you’re really interested, the technical details are in the Debian release notes here.)
However, we’ve made a few small changes to our image that are worth mentioning.
New versions of applications
Version 3.0.1 of Sonic Pi is included – this includes a lot of new functionality in terms of input/output. See the Sonic Pi release notes for more details of exactly what has changed.
The Chromium web browser has been updated to version 60, the most recent stable release. This offers improved memory usage and more efficient code, so you may notice it running slightly faster than before. The visual appearance has also been changed very slightly.
In Jessie, we used PulseAudio to provide support for audio over Bluetooth, but integrating this with the ALSA architecture used for other audio sources was clumsy. For Stretch, we are using the bluez-alsa package to make Bluetooth audio work with ALSA itself. PulseAudio is therefore no longer installed by default, and the volume plugin on the taskbar will no longer start and stop PulseAudio. From a user point of view, everything should still work exactly as before – the only change is that if you still wish to use PulseAudio for some other reason, you will need to install it yourself.
Better handling of other usernames
The default user account in Raspbian has always been called ‘pi’, and a lot of the desktop applications assume that this is the current user. This has been changed for Stretch, so now applications like Raspberry Pi Configuration no longer assume this to be the case. This means, for example, that the option to automatically log in as the ‘pi’ user will now automatically log in with the name of the current user instead.
One other change is how sudo is handled. By default, the ‘pi’ user is set up with passwordless sudo access. We are no longer assuming this to be the case, so now desktop applications which require sudo access will prompt for the password rather than simply failing to work if a user without passwordless sudo uses them.
Scratch 2 Sense HAT extension
In the last Jessie release, we added the offline version of Scratch 2. While Scratch 2 itself hasn’t changed for this release, we have added a new extension to allow the Sense HAT to be used with Scratch 2. Look under ‘More Blocks’ and choose ‘Add an Extension’ to load the extension.
This works with either a physical Sense HAT or with the Sense HAT emulator. If a Sense HAT is connected, the extension will control that in preference to the emulator.
Fix for Broadpwn exploit
A couple of months ago, a vulnerability was discovered in the firmware of the BCM43xx wireless chipset which is used on Pi 3 and Pi Zero W; this potentially allows an attacker to take over the chip and execute code on it. The Stretch release includes a patch that addresses this vulnerability.
There is also the usual set of minor bug fixes and UI improvements – I’ll leave you to spot those!
How to get Raspbian Stretch
As this is a major version upgrade, we recommend using a clean image; these are available from the Downloads page on our site as usual.
Upgrading an existing Jessie image is possible, but is not guaranteed to work in every circumstance. If you wish to try upgrading a Jessie image to Stretch, we strongly recommend taking a backup first – we can accept no responsibility for loss of data from a failed update.
To upgrade, first modify the files /etc/apt/sources.list and /etc/apt/sources.list.d/raspi.list. In both files, change every occurrence of the word ‘jessie’ to ‘stretch’. (Both files will require sudo to edit.)
Then open a terminal window and executesudo apt-get update sudo apt-get -y dist-upgrade
Answer ‘yes’ to any prompts. There may also be a point at which the install pauses while a page of information is shown on the screen – hold the ‘space’ key to scroll through all of this and then hit ‘q’ to continue.
Finally, if you are not using PulseAudio for anything other than Bluetooth audio, remove it from the image by enteringsudo apt-get -y purge "pulseaudio*"
Since the release yesterday, we’ve had a few small issues reported. Here’s an update on them:
- Some people have noticed that the Chinese and Japanese fonts are missing, resulting in garbled text when the locale is changed. This is due to a font package which was present in Jessie but not included in Stretch. A suitable alternative is the Droid fonts package – to install it, do:sudo apt-get install fonts-droid-fallback
- There is a bug in the Raspberry Pi Configuration window which means the “Set Keyboard…” button on the Localisation tab doesn’t work. This has been fixed – to get the fix from apt, do:sudo apt-get update sudo apt-get upgrade
- There is an intermittent bug in the interaction between the RealVNC server application and the desktop – you might find that the taskbar sometimes vanishes when booting if the VNC server is enabled. This is intermittent, so rebooting a few times may help. If not, to get the taskbar to display, hit Ctrl-Alt-T to display a terminal window, and in the terminal enter
lxpanel -p LXDE-pi; you’ll need to leave that terminal open while running. We recommend disabling the VNC server in Raspberry Pi Configuration for now; RealVNC have found a fix for the issue which we are currently testing; we hope to have it available for download in the near future.
- Some people are reporting that Chromium is crashing on some videos and animations. It looks as if there is a problem in the hardware-accelerated video playback engine which causes it to fail on certain files; we have a potential fix for this which we are testing at the moment.
This article and images were originally posted on [Raspberry Pi] August 17, 2017 at 05:03AM
Credit to Author and Raspberry Pi