I have a Pi 2 that has been kept current with the latest Raspian. I am trying to install the Pixel update that was posted on the Raspberry Pi blog this morning. Here are the commands:

sudo apt-get update  
sudo apt-get dist-upgrade  
sudo apt-get install -y rpi-chromium-mods  
sudo apt-get install -y python-sense-emu python3-sense-emu  
sudo apt-get install -y python-sense-emu-doc realvnc-vnc-viewer

The first two commands appear to execute correctly. Line 3, installing the chromium piece, fails, as it cannot find rpi-chromium-mods.

  • I think I may have found the problem. I am on Wheezy, not Jessie. Which raises the question: Can Pixel be installed on top of Wheezy? Many Pi2 users may have never upgraded. Sep 29, 2016 at 14:09
  • Possibly but probably not. See: raspberrypi.stackexchange.com/q/26041/5538 However, beware that if you run dist-upgrade after editing jessie into sources.list (which I guess you may have to), you will be upgrading the whole system.
    – goldilocks
    Sep 29, 2016 at 21:07

1 Answer 1


On September 28, 2016, Simon Long presented in the official Rasperri Pi blog a beautification of the GUI for the Raspian distro (https://www.raspberrypi.org/blog/introducing-pixel/) called PIXEL (“Pi Improved Xwindows Environment, Lightweight”). He also explained how to update an existing Raspian Jessie installation:

sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install -y rpi-chromium-mods

I followed the instructions exactly but got stuck at the 3rd statement:

$ sudo apt-get install -y rpi-chromium-mods
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package rpi-chromium-mods

Thanks to Simon's support I could fix the problem by appending "ui" as component to all Apt lines found in /etc/apt/sources.list.d/raspi.list:

deb http://archive.raspberrypi.org/debian/ jessie main ui

After having edited the file, I resynchronized my repos ( sudo apt-get update ) and the rpi-chromium-mods package installed successfully ( sudo apt-get install -y rpi-chromium-mods ).

  • Although this wasn't really a direct answer to the question, I think it should stand as confirmation of the issue, since you both seem to have followed the instructions in the blog. I did not look through the comments but that might be worthwhile for further confirmation.
    – goldilocks
    Sep 28, 2016 at 23:35
  • Sorry for posting an "answer" rather than a "comment". I also want to clarify that I'm on Jessie and not on Wheezy.
    – F.M.
    Sep 29, 2016 at 21:03
  • See Barbecue Joe's recent comment on the question. Are you still using Wheezy too?
    – goldilocks
    Sep 29, 2016 at 21:05
  • Ok, my problem is solved. It turned out that "ui" must be added to all lines found in /etc/apt/sources.list.d/raspi.list - see also raspberrypi.org/blog/introducing-pixel/#comment-1264036
    – F.M.
    Sep 29, 2016 at 22:12
  • If you'd like to edit that into your answer it may be appreciated by others ;)
    – goldilocks
    Sep 29, 2016 at 22:19

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