With lots of study in forums answered to the title, I am not able to solve. Please help !!!!

I am getting this when I run update via apt-get update every time.

I tried

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

The code does not work even after performing reboot

Also, I tried importing key

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5 and shows gpg unprocessed: 1

Distributor ID: Ubuntu
Description:    Ubuntu 14.04.4 LTS
Release:        14.04
Codename:       trusty

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