$ sudo apt-get update
$ sudo apt-get install lxappearance-obconf 

lxappearance-obconf is installed in your system.

Make ensure the lxappearance-obconf package were installed using the commands given below,

$ sudo dpkg-query -l | grep lxappearance-obconf *

You will get with lxappearance-obconf package name, version, architecture and description in a table

lxappearance-obconf package basic information: