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I have a Raspberry Pi 2 Model B, with Wheezy installed. Running some commands tells me version 7.11.x is installed. I would like to upgrade to Raspbian Jessie, which is on 8.8, if I'm not mistaken.

One way is to go to raspberrypi.org and download the latest image, but I don't have a micro SD card reader. Is there any way I can download it and upgrade it directly on my Pi?

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As per this post on the Raspberry Pi Forum:

  1. Modify the file /etc/apt/sources.list by running sudo nano /etc/apt/sources.list. Change wheezy to jessie in the first line, so it reads deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi

  2. Modify the file /etc/apt/sources.list.d/raspi.list by running sudo nano /etc/apt/sources.list.d/raspi.list. change wheezy to jessie in the first line and add ui to the end of that line. The line should read deb http://archive.raspberrypi.org/debian jessie main ui

  3. Create the directory /home/pi/.config/autostart by running mkdir /home/pi/.config/autostart in the terminal. (Note the . in front of config.)

  4. Run sudo apt-get update in the terminal to update the apt index files.

  5. Run sudo apt-get dist-upgrade to start the upgrade process. This will take a couple of hours. Whenever prompted to update a file during this process, choose the Y option to accept the new file; if you don't want to be bothered with these prompts, then call apt-get with the -y option using sudo apt-get -y dist-upgrade.

On first boot of Jessie you will see messages about:

Calling CRDA to update world regulatory domain

Wait until the messages stop then login as the user pi. You may need to run start x to get the GUI to load up. This screen might go black as it loads the GUI this is fine.

When the GUI has loaded you can install all the new software packages by running:

sudo apt-get install rc-gui libreoffice libreoffice-gtk alacarte bluej greenfoot claws-mail

This will install the new GUI version of raspi-config, LibreOffice and its GTK extension, the Alacarte menu editor, the BlueJ and Greenfoot Java IDEs and the ClawsMail email client.

The GUI will need cleaning up:

  1. To load the new version of the PiX GTK theme. (Note the . in front of themes) run ``

  2. To prevent the ClipIt application from automatically starting on boot run sudo rm /etc/xdg/autostart/clipit-startup.desktop

  3. To prevent the Wicd network manager from automatically starting on boot run sudo rm /etc/xdg/autostart/wicd-tray.desktop

  4. To remove the huge list of application shortcuts in the “Other” menu run sudo rm –rf /var/lib/menu-xdg

  5. To select to boot to desktop with autologin as the pi user run sudo raspi-config nonint do_boot_behaviour_new B4

  6. To hide the menu shortcut to the Openbox window manager, whose functionality has been replaced by the Appearance Settings preferences application run sudo rm /usr/share/applications/obconf.desktop

If possible I would strongly recommend a clean install of Jessie, it's probably going to be less hassle then running all of these commands. Definitely backup anything important before you attempt the upgrade.

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As an alternative (because the above procedure will take a wee bit of time), connect a USB-multicard reader/writer to your Pi, and flash a freshly downloaded Jessie to it. The Pi1+2 supply at most 100mA on USB IIRC, which is enough.

The latest image can be found here: https://downloads.raspberrypi.org/raspbian_latest

Try: wget -qO - https://downloads.raspberrypi.org/raspbian_latest | zcat -dfc | dd bs=1M of=/dev/sda, assuming that your new microsd card is sda. Check with fdisk -l, and of course make some backup elsewhere with rsync -avuP ... ...

If you have not made enormous changes outside ~pi, you can just copy your home folder to the new card before booting it and expanding it.

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