KompoZer is an open source WYSIWYG HTML editor based on the now-discontinued Nvu editor. Kompozer was dropped from the repos, since it is no longer maintained in Debian. But, you can still install it on newer releases.

To get started, open terminal window by Ctrl+Alt+T key combination, then run following commands:

1. Install dependencies (In my Ubuntu 13.04 desktop, I found them already installed):

sudo apt-get install libatk1.0-0 libc6 libcairo2 libfontconfig1 libfreetype6 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk2.0-0 libidl0 libnspr4 libnss3 libpango1.0-0 libpng12-0 libstdc++6 libx11-6 libxft2 libxinerama1 libxrender1 libxt6 zlib1g

2. You may check 32-bit or 64-bit system by System Settings -> Details.

Ubuntu-Details

3. For 32-bit, run following commands one by one to download and install DEBs:

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer-data_0.8~b3.dfsg.1-0.1ubuntu2_all.deb

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer-dev_0.8~b3.dfsg.1-0.1ubuntu2_all.deb

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer_0.8~b3.dfsg.1-0.1ubuntu2_i386.deb

sudo dpkg -i kompozer-data_0.8~b3.dfsg.1-0.1ubuntu2_all.deb kompozer-dev_0.8~b3.dfsg.1-0.1ubuntu2_all.deb kompozer_0.8~b3.dfsg.1-0.1ubuntu2_i386.deb

For 64-bit, run these commands instead:

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer-data_0.8~b3.dfsg.1-0.1ubuntu2_all.deb

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer-dev_0.8~b3.dfsg.1-0.1ubuntu2_all.deb

wget https://launchpad.net/ubuntu/+archive/primary/+files/kompozer_0.8~b3.dfsg.1-0.1ubuntu2_amd64.deb

sudo dpkg -i kompozer-data_0.8~b3.dfsg.1-0.1ubuntu2_all.deb kompozer-dev_0.8~b3.dfsg.1-0.1ubuntu2_all.deb kompozer_0.8~b3.dfsg.1-0.1ubuntu2_amd64.deb

Once installed, launch KompoZer from Unity Dash. Enjoy!