Unresolved gpg key error while upgrading packages in Linux

[Hahtalekin]

Recently while updating the packages I got a huge error. On reading that particular error I got to know that it is gpg key error. It was showing the particular gpg key was unresolved and so I had to act on it accordingly But I don’t have any idea what to do further. That’s when I thought its best to ask with you all. Since you all must be having some idea on how to approach this problem and accordingly solve. If you want I will report the detailed error below so that you can read it and you will get some idea about the particular error.

W: GPG error: http://qt-kde.debian.net experimental-snapshots Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93DD2AE2E79C8BAB
W: GPG error: http://linux-mint.froonix.org julia Release: The following signatures were invalid: BADSIG 3EE67F3D0FF405B2 Clement Lefebvre (Linux Mint Package Repository v1) <[email protected]>
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.getdeb.net maverick-getdeb Release: The following signatures were invalid: BADSIG A8A515F046D7E7CF GetDeb Archive Automatic Signing Key <[email protected]>

W: GPG error: http://archive.canonical.com maverick Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]>
W: Failed to fetch http://progprak.scale.uni-koeln.de/lazarus/dists/lazarus-testing/universe/source/Sources.gz  404  Not Found

W: Failed to fetch http://progprak.scale.uni-koeln.de/lazarus/dists/lazarus-testing/universe/binary-amd64/Packages.gz  404  Not Found

W: Failed to fetch http://archive.getdeb.net/ubuntu/dists/maverick-getdeb/Release  

W: Some index files failed to download, they have been ignored, or old ones used instead.

I am waiting for your response.

[Zhankana_n]

Yes indeed the problem is with the gpg key. First let us solve the source of this problem. What you have to do is go and type the following command in the terminal.

cat /etc/apt/sources.list
ls /etc/apt/sources.list.d/

Well this will give you a list of outputs. So do specify all this output to me. The only I can recognize the problem.

[Hahtalekin]

Well looking at the output I cannot post all the detailed output here but I can describe you some of the output here. It shows me some problem with the QT-KDE, Linux mint package, get deb file and also the ubuntu archieve. These were the main errors that I could notice in my output. This is the precise output that I can give you out here. So if you have any solutions for such particular problem then do let me know.

[Dolsy_bendal]

It could have been better if you could have pasted the complete output in the post. Anyways talking about the qt-kde problem and also the other problem lets try installing the keys for all that particular problem see if that works or not.

//For the qt ked problem type the following code in the terminal
sudo apt-get install --reinstall pkg-kde-archive-keyring
//for the linux mint type
sudo apt-get install --reinstall linuxmint-keyring
//for the get deb file type
 wget -q -O- http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add –
//and finally for the ubuntu archieve type the command
sudo apt-get install --reinstall ubuntu-keyring

After doing all this then try and run the apt-get update again and see if there is any change.

[Hahtalekin]

Well the solution did not seem to have worked for me. I did not get the proper updates of the package. While this time it is giving some problem with the deb key format. I think the problem is quite serious and I will have a talk with the specific people related to it and will solve it with them. Anyways thanks for the solutions that you have given me and appreciate your efforts that you have took to solve my issue.