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Whenever I run sudo apt-get update, I get this error: 

E: GPG error: http://opart.org ./ InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

I get the same error when I try to install something via the software center.

Failed to download repository information, Check your internet connection

And the details has the same error that I get on the terminal.

This is the output of sudo grep -R "opart.org" /etc/apt/ :

sudo grep -R "opart.org" /etc/apt/
/etc/apt/sources.list.save: deb opart.org/debian/ ./
/etc/apt/sources.list.save:deb opart.org/debian/ ./
/etc/apt/sources.list:deb opart.org/debian/ ./
/etc/apt/sources.list:deb opart.org/debian/ ./

I'v removed the http from the links since i cant post more than 2 links here.

Pilot6
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Aymen Rizwan
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2 Answers2

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The side http://opart.org isn't longer available.

This web site is for sale

Therefore

grep -rl 'opart.org' /etc/apt/ | xargs sudo sed -i '/opart\.org/d'
sudo apt-get update
A.B.
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0

Run in terminal

sudo sed -i '/opart\.org/d' /etc/sources.list

That will fix the issue with sudo apt-get update.

The problem was because you have added the software source that does not exist any more to your /etc/sources.list file.

Pilot6
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