GPG invalid signature problem in ubuntu

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Run bellow commands if there is problem with gpg key invalid
error while updating apt chache 
by using 
$ sudo apt-get update
this is very common issue sometimes happens after update ubuntu 
$ 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

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