method overriding, embedding and pointer in golang. Can not assign embedded variable

In go code, there is a method to say:

init() {
   service = &Service {
      updater: updaterVariable
   } 
}

updater field has type of *lib.Updater

I am trying to override one method of lib.Updater and pass it to &Service in init method (as above).

What I am doing is:

type ModifiedUpdater struct {
  lib.Updater
}
//overridden method
func (f *ModifiedUpdater) Update(...) { 
  //implementation
}

When I initialize the modified updater and try to pass to Service, I am getting something similar to this "Cannot use variable of *ModifiedUpdater as *Updater"

The way I am trying to assign:

init() {
   modifiedUpd := &ModifiedUpdater{*lib.Updater{conn}}
   service = &Service {
      updater: modifiedUpd
   } 
}

How can I fix it or what approach should I take?
Thank you.

In Go, we do not have inheritance and you can not override methods of structs. To achieve polymorphism you have Interfaces, in your case you should define some

type Updater interface {
   Update(...)
}

then implement this method in some struct

type somestruct struct {
}
func (ss somestruct) Update(...) {
    //do some work
}

and finally, you can use this struct in your init() function

init() {
  service = &Service {
     updater: somestruct{}
  } 
}

your Service should look like this:

type Service struct {
     Updater updater
}