For 32-bit, run the following commands:

1. Download kompozer *.deb

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_0.8~b3.dfsg.1-0.1ubuntu2_i386.deb

2. install kompozer

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

3. install depencies

sudo apt-get install -f

For 64-bit, run the following commands:

1. Download kompozer *.deb

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_0.8~b3.dfsg.1-0.1ubuntu2_amd64.deb

2. install kompozer

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

3. install depencies

sudo apt-get install -f

Found from http://www.enqlu.com/2014/04/how-to-install-kompozer-on-ubuntu-14-04-lts-or-linux-mint-17.html