Raspberry Pi

Con la messa in commercio del Raspberry Pi 2 Modello B dotato di processore ARMv7 BCM2709, è ora possibile installare Ubuntu sul Raspberry Pi.

Si precisa quindi che le informazioni contenute in questa pagina fanno riferimento al Raspberry Pi 2 e non ai modelli precedenti.

Ubuntu 14.04 LTS

È disponibile un'immagine di Ubuntu 14.04 LTS Trusty Tahr per the Raspberry Pi 2 con PPA dedicati che contengono kernel e firmware funzionanti sul Raspberry Pi 2.

Quest'immagine è mantenuta dalla comunità di Ubuntu e non è supportata ufficialmente. Il 3.13 kernel è stato sostituito con con una versione aggiornata del kernel 3.18, per il quale non sono garantiti gli aggiornamenti di sicurezza forniti invece per la versione del kernel LTS kernel.

Download

• Download 2015-03-02-ubuntu-trusty.zip (firma GPG)

• 145MiB ZIP, 1.75GiB immagine non compressa
• Lo username è "ubuntu", la password è "ubuntu"

Se si preferisce scaricare un'immagine precedente a quella indicata non è necessario reinstallare, ma tuttavia si consiglia di verificare il changelog in basso.

Installation

L'installazione segue la stessa procedura delle altre immagini per Raspberry Pi. È possibile consultare una guida (in lingua inglese) sul sito ufficile del progetto Raspberry Pi.

In alternativa the distribution .zip includes a .bmap file. If you are installing to the SD card from Linux, you may use the bmap-tools package to save some time by writing only the non-zero blocks.

$ sudo bmaptool copy --bmap ubuntu-trusty.bmap ubuntu-trusty.img /dev/sdX

Usage

• There are no Raspbian-specific utilities included, specifically no automatic root resizer. However, it's not hard to do manually. Once booted:

$ sudo fdisk /dev/mmcblk0

Delete the second partition (d, 2), then re-create it using the defaults (n, p, 2, enter, enter), then write and exit (w). Reboot the system, then:

$ sudo resize2fs /dev/mmcblk0p2

• There is no swap partition/file included. If you want swap, it's recommended you do:

$ sudo apt-get install dphys-swapfile

You should have a (resized) SD card at least 4GB, because by default it will want to create a ~2GB swapfile.

• This is a minimal ubuntu-standard image. If you want a full desktop, go ahead and do so:

$ sudo apt-get install xubuntu-desktop  # or
$ sudo apt-get install lubuntu-desktop  # or
$ sudo apt-get install kubuntu-desktop  # etc

Ubuntu (Unity) and Ubuntu-GNOME just display a blank screen, presumably because they require 3D compositing. Kubuntu works but is slow unless you turn off desktop effects under System Settings. Xubuntu and Lubuntu work fine out of the box.

• If you would like to install an SSH server for remote access:

$ sudo apt-get install openssh-server

• An accelerated x.org video driver is available (fbturbo), though this is limited to hardware accelerated window moving/scrolling on the Raspberry Pi. To install:

$ sudo apt-get install xserver-xorg-video-fbturbo

Then add this to /etc/X11/xorg.conf (create if it doesn't already exist):

Section "Device"
    Identifier "Raspberry Pi FBDEV"
    Driver "fbturbo"
    Option "fbdev" "/dev/fb0"
    Option "SwapbuffersWait" "true"
EndSection

• As with Raspbian, VideoCore packages are available:

$ sudo apt-get install libraspberrypi-bin libraspberrypi-dev

However, since these packages are compiled from source during build, the files are installed in their "proper" locations in /usr. Some third-party scripts may expect e.g. /opt/vc/bin/vcgencmd; if so, this hack should do it:

$ sudo ln -s /usr /opt/vc

(Raspbian packages use precompiled repositories during build, which install in /opt/vc.) vcdbg and edidparser are not part of the open source package and must be installed separately:

$ sudo apt-get install libraspberrypi-bin-nonfree

• Serial console / login

To enable the serial console, change the /boot/cmdline.txt as follows:

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootwait

and add a new file /etc/init/ttyAMA0.conf:

start on stopped rc or RUNLEVEL=[12345]
stop on runlevel [!12345]

respawn
exec /sbin/getty -L 115200 ttyAMA0 vt102

Building

• The script used to build the images is available here.

Links

• raspberrypi.org forums thread

• Reddit thread

• Ryan Finnie original blog announcement

• PPAs:

  • ppa:fo0bar/rpi2 - Stable packages (enabled in the default image)

  • ppa:fo0bar/rpi2-staging - Staging builds

  • ppa:fo0bar/rpi2-nightly - Nightly automatic builds of some packages

Changelog

2015-03-02

• Updated Ubuntu / PPA packages
• Kernel module bcm2708_rng now loaded on boot
• Blacklisted platform modules not applicable to the RPi2 (snd_soc_pcm512x_i2c, snd_soc_pcm512x, snd_soc_tas5713, snd_soc_wm8804)

2015-02-19

If you installed the 2015-02-17 image, you don't need to reinstall this image, but you should remove /var/lib/dbus/machine-id and reboot.

• Updated Ubuntu / kernel packages
• Default apt-src repositories are now commented out
• Installed language-pack-en package
• Sound driver (snd_bcm2835) now loaded by default
• Created legacy /boot/config.txt and /boot/cmdline.txt symlinks as these live in /boot/firmware
• Cleaned up /etc/hosts formatting
• Renamed ubuntu user GECOS from "Ubuntu" to "Ubuntu user"
• Removed variant /var/lib/dbus/machine-id (will be regenerated on first boot)
• Removed console=ttyAMA0,115200 from default cmdline.txt (interferes with non-console use of the serial port)

2015-02-17

• Initial release

Snappy Ubuntu Core

Snappy Ubuntu Core is a new rendition of Ubuntu with transactional updates - a minimal server image with the same libraries as today’s Ubuntu, but applications are provided through a simpler mechanism. A developer preview is available for the Raspberry Pi 2.