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It looks like you are importing the Django provided user model not your custom user model.
Try changing:
from django.contrib.auth.models import User
To
from django.contrib.auth import get_user_model
Then select your users using get_user_model
def index(request):
utente = get_user_model().objects.filter(username__in=["user"])
return render(request,"blog/index.html", {'users' : utente})
Also, make sure that AUTH_USER_MODEL is set to your custom user model in your settings.py file.
AUTH_USER_MODEL = 'myapp.MyUser'
Source:stackexchange.com