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After not using kali for a long time (+/- 2 years) I decided to run it again. First thing I did was opening my terminal and updating kali using
apt-get update && apt-get upgrade.
To my surprise it couldn't find any update. I checked my sources.list and found several lines, which I can't remember anymore. Deleted and replaced them with "deb http://http.kali.org/kali kali-rolling main non-free contrib" according to the official website.
Opened the terminal again and entered the update command. It found a ton of updates, dpkg'd most of them and after half an hour updating was completed.
Got the same result when trying to open recovery mode. What is the reason behind my bricked kali and how do I resolve my problem?