A binary for all Linux versions would be great, but isn't supportable. One just for Ubuntu might confuse others. There are links from the Sigil pages for people providing deb packages and other packages although they haven't been tested.
Building on Ubuntu, my main platform, is pretty straightforward. The Running from Source instructions on the web describe what to do, but if you want even more step by step commands then try this.
Note that since I've installed various packages on my system its possible that the install command should list a few other things that might be needed for a completely clean system.
Code:
sudo apt-get install build-essential cmake libqt4-dev
-> DOWNLOAD source code file to $HOME/Downloads
SIGIL=$HOME/sigil-0.5.3; export SIGIL
mkdir $SIGIL $SIGIL/source $SIGIL/build $SIGIL/run
cd $SIGIL/source
unzip $HOME/Downloads/Sigil-0.5.3-Code.zip
cd $SIGIL/build
-> OPTION 1 - install separate copy in your home area
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$SIGIL/run $SIGIL/source
make install
$SIGIL/run/bin/sigil
-> OPTION 2 - install system wide
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr/local $SIGIL/source
sudo make install
/usr/local/bin/sigil