$ sudo apt-get update
$ sudo apt-get install lxmenu-data 

lxmenu-data is installed in your system.

Make ensure the lxmenu-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep lxmenu-data *

You will get with lxmenu-data package name, version, architecture and description in a table

lxmenu-data package basic information: