wkhtmltopdf for odoo , follow below steps
sudo wget https://github.com/ananthukrishna/wkhtmltopdf/raw/master/wkhtmltox-0.12.1_linux-trusty-amd64.deb
Install the package using command
dpkg -i wkhtmltox-0.12.1_linux-trusty-amd64.deb
Copy wkhtmltoimage to /usr/bin location from /usr/local/bin by using below command
sudo cp /usr/local/bin/wkhtmltoimage /usr/bin/wkhtmltoimage
Copy wkhtmltopdf to /usr/bin location from /usr/local/bin by using below command
sudo cp /usr/local/bin/wkhtmltopdf /usr/bin/wkhtmltopdf