I realize this is going to be contentions post to some but as someone who wants to Ubuntu succeed in it's mission as a consumer OS for wide spread appeal I think it has to be said.
Stop developing Ubuntu for linux users.
If your using the command line your doing it wrong.
Ubuntu & other linux OS appeal to only two groups the most basic simple user or a linux command line loving expert faimilar with the deep inner workings.
Ubuntu barely even gets the basic user right, in the beginners forum there is a sticky thread for leaning linux command line, no beginner forum should ever have that.
Windows (& OSX) relegated the command line to advanced trouble shooting and IT shops long ago, both OS are designed for GUI power users whereas Ubuntu still feels very unpolished with command line work popping up for some stuff even I consider basic, this doesn't happen on Windows or OSX.
Then there is application support, outside of the app store even if there is a linux version of an app it is still a nightmare to install incomparison to Windows which has easy installers for apps or OSX just drag and drop the app. Ubuntu needs something similar to Windows if it is ever going to get users onboard and convince developers to make Ubuntu specific apps not just generic linux apps.
One example is Steam, on Windows or OSX installing Steam is a breeze I download Steam installer and off I go, on Ubuntu
1) Go to app store, click Steam and tells me I need an Ubuntu One account
2) Sign up for account and go back and get Steam which downloads a Steam installer
3) Run Steam installer and it brings up command line prompts asking for root access with Y/N confirms then shows the guts of the install all the way through.
Another example is VLC or Handbrake other popular power user apps, all a breeze to install on Win PC but unless you wait for app store update version then installing manually is a pain in the ass. You should be able to download and install apps just like Windows, without that you wont win them over.
It's shabby and unprofessional looking, not to menton other parts of Ubuntu like on a few PC's I have installed on show the command line background workings when shutting down the PC, it's like the OS can barely keep the GUI together in places.
Google's Chrome OS is a lot more simplistic so it does less than Ubuntu but for what it does do it's in a more professional and competent looking manner without a hint of any command line or linux based nonsense that still infests Ubuntu. If Ubuntu doesnt get its act together then Chrome OS is eventually going to be the number 1 PC linux OS, it's already making inroads in business and as it slowly involves into a more featured PC OS, Ubuntu will still be wondering why the mainstream went with Chrome.