another instance of security being a dick (f.t xargana):
```
Err:6 https://pkg.cloudflare.com/ jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 254B391D8CACCBF8
Reading package lists... Done
W: GPG error: https://pkg.cloudflare.com/ jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 254B391D8CACCBF8
E: The repository 'https://pkg.cloudflare.com/ jammy InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.