When installing Docker you get“failed to fetch”… BUT when you run sudo apt-get update you get “The following signatures were invalid EXPKEYSIG ED**** Kali Linux Repository <devel@kali.org>”

Issue 1: Outdated repo
Issue 2: Key Signature verification

Resolution:

### Download
```
wget http://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2022.1_all.deb```
```

### Install

```
sudo dpkg -i kali-archive-keyring_2022.1_all.deb
```

### remove downloaded file (housecleaning)

```
rm kali-archive-keyring_2022.1_all.deb
```

### update
```
sudo apt-get update
```

### For Convenience: Add && after every command

```
wget http://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2022.1_all.deb && sudo dpkg -i kali-archive-keyring_2022.1_all.deb && rm kali-archive-keyring_2022.1_all.deb && sudo apt-get update