Kali-Linux Sources.list 2018/2019 ( Open Terminal - nano /etc/apt/sources.list )

Kali-Linux Sources.list 2018-2019

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


# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

sudo apt-get update
Ign:1 https://pkg.jenkins.io/debian binary/ InRelease
Hit:2 https://pkg.jenkins.io/debian binary/ Release
Ign:3 http://pkg.jenkins-ci.org/debian binary/ InRelease
Hit:6 http://pkg.jenkins-ci.org/debian binary/ Release
Hit:5 http://mirrors.neusoft.edu.cn/kali kali-rolling InRelease
Err:5 http://mirrors.neusoft.edu.cn/kali kali-rolling InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED444FF07D8D0BF6
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.neusoft.edu.cn/kali kali-rolling InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED444FF07D8D0BF6
W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED444FF07D8D0BF6
W: Some index files failed to download. They have been ignored, or old ones used instead.

[ Error writing /etc/apt/sources.list: Permission denied ] how to fix

sudo chown root:root /etc/apt/sources.list