You Do Need power plug adapter while traveling from Lebanon to Papua New Guinea.

Here is Why You Need An Adapter

The outlet and plug type used in Papua New Guinea is I and in Lebanon are C, D and G. This is how they look like.

Lebanon

In Lebanon, outlets of type C, D and G are in use.

Type C

Type D

Type G

Papua New Guinea

In Papua New Guinea, outlets of type I are in use.

Type I