$ sudo apt-get update
$ sudo apt-get install lighttpd-mod-webdav 

lighttpd-mod-webdav is installed in your system.

Make ensure the lighttpd-mod-webdav package were installed using the commands given below,

$ sudo dpkg-query -l | grep lighttpd-mod-webdav *

You will get with lighttpd-mod-webdav package name, version, architecture and description in a table

lighttpd-mod-webdav package basic information: