Mengatasi error BADSIG pada ubuntu

Sering kali ketika kita melakukan update ubuntu dengan perintah sudo apt-get update melalui terminal muncul error BADSIG seperti ini:

W: GPG error: http://kambing.ui.ac.id precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

Bagaimana mengatasinya? Jalankan perintah berikut:

sudo apt-get clean 
cd /var/lib/apt 
sudo mv lists lists.old 
sudo mkdir -p lists/partial 
sudo apt-get clean 
sudo apt-get update

*—————
Sumber: http://itsfoss.com/solve-badsig-error-quick-tip/

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