adb uninstall failed

Question

I am writing some sample apps.
After I debug these apps, I don\'t see an uninstall button in my device\'s application management.
When I do adb uninstall, it always

Answer 1

Mine was on samsung j7 pro, issue was simple.

j7y17lte:/system $ pm list packages|grep airtel                                                                                                                                                                                            
package:com.samsung.android.airtel.stubapp

j7y17lte:/system $ pm uninstall -k --user 0 com.samsung.android.airtel.stubapp

DO NO-NOT include the word package in the unistall command