Обновление apt-get install не работает в Kali Linux

При попытке обновления получаю следующее:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Unable to locate package update

мой etc / apt / sources.list выглядит так:

deb http://repo.kali.org/kali kali-rolling main non-free contrib

deb-src http://repo.kali.org/kali kali-rolling main non-free contrib