Cannot remove a repository that complains it has no public key

Question

I use Ubuntu Studio 16.04 LTS, 64 bit, into 3 desktop PC (Intel i5 and i7) and 4 laptops (Intel Pentium). All with 8 GB of RAM.

Since about a week ago, I've been getting the following message each time I try to update/upgrade the system:

https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease" has no Public Key. It isn't safe to use this kind of repository.

I tried to remove that repository (which I don't remember adding) with the terminal command:

sudo add-apt-repository -r <repository to  remove>

But, even though the system seems to perform that action, the repository is used next time I type:

sudo apt-get update

This repository isn't visible in Synaptic Software Manager and/or Ubuntu Software Center.

How can I fix it?

The linked question has little to do with this one, especially if you compare the answers. — David Foerster, Sep 02 '17 at 20:27
Related: https://askubuntu.com/questions/13065/how-do-i-fix-the-gpg-error-no-pubkey — Elder Geek, Sep 02 '17 at 20:51

score 2 · Accepted Answer · edited Sep 02 '17 at 20:27

2

Try modifying the sources.list file directly and either remove or comment out (probably the better solution). The sources file should be located at /etc/apt/sources.list.

See also the Official Ubuntu documentation on package repository configuration.

edited Sep 02 '17 at 20:27

David Foerster

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answered Oct 14 '16 at 17:08

toolfan2k4

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Cannot remove a repository that complains it has no public key

1 Answers1

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