Cannot uninstall an app from adb

I am trying to uninstall an app which came to me with the phone ( an app for senior users - sort of launcher).

My device is : LG L70
Android version : 4.4.2
However I cannot uninstall it from the phone by dragging it from app screen. I've tried to uninstall it from the adb:

adb uninstall "package name"

but I get:

Failure

as a response.

When I list all my aps from the adb:

adb shell 'pm list packages -f'

I cannot find the app on the list.
The only way that helped me to discover the package name(in order to uninstall it) is by using "System Info for Android" app...

What can be done in order to remove this annoying app?

I've rooted the device and did a factory reset...

Any help will be appreciated.