1. Download b2g and extract the package:

2. Download and install Gaia:
Open terminal from the dash home:
git clone git://github.com/mozilla-b2g/gaia
Then:
make -C gaia profile
3. Now run Firefox Mobile B2G:
In terminal run:
PATH/TO/B2G-foder/b2g -profile gaia/profile
I downloaded b2g and extracted it under ~/home/jeremy/b2g/, so I ran:
/home/jeremy/b2g/b2g -profile gaia/profile
Enjoy

I love Spotify.  If you haven’t tried it you should definitely check it out. I had been having some problems with the newer preview releases of the application on my Ubuntu machine at home. If you run into issues yourself you can try the following in terminal:

Clear cache: rm -Rf ~/.cache/spotify

If Spotify continues to crash run a “strace -e open spotify” in terminal and post it to the forums for more advanced assistance.  Good luck!  This fixed all of my issues so I wanted to make sure and share it in case it also helped others running Spotify on Ubuntu.

Look how beautiful Gnome 3 is on Ubuntu 11.10.  I love it…

In February 2011 Bluefish 2.0.3 was released. This mini-guide demonstrates how to build this version from source under Ubuntu and has been tested most recently under Natty Narwhal. First we need to remove the repository version if it has been installed:

sudo apt-get remove bluefish

 
Next download some compiling tools and dependencies:

sudo apt-get install build-essential checkinstall libart-2.0-dev libaspell-dev \
libbonobo2-dev libbonoboui2-dev libgail-dev libgnome-keyring-dev libgnome2-dev \
libgnomecanvas2-dev libgnomeui-dev libpcre3-dev libpcrecpp0 libpopt-dev \
libgvfscommon-dev libgucharmap2-dev libenchant-dev intltool

 
Next download the source code, open the tarball and compile and install it with the following single command:

cd $HOME && \
wget http://bluefish.mrball.net/stable/source/bluefish-2.0.3.tar.bz2 && \
tar xjvf bluefish-2.0.3.tar.bz2 && cd bluefish-2.0.3 && \
./configure && make && \
sudo checkinstall --fstrans=no --pakdir "$HOME/Desktop" --backup=no \
  --deldoc=yes --deldesc=yes --delspec=yes --default --pkgversion "2.0.3" && \
make distclean

Source: http://ubuntuforums.org/showthread.php?t=1426958