mintupdate gives me an error and shows no updates.

[vaishaks]

When I run mintUpdate, it gives me this error.

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    W: GPG error: http://archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
    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.canonical.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
     
    W: Failed to fetch http://www.remastersys.com/ubuntu/dists/precise/InRelease  Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/main/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/restricted/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/universe/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/multiverse/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/main/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/restricted/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/universe/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/multiverse/binary-amd64/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maya-updates/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.202 80]
     
    W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/Release 
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/main/binary-amd64/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/restricted/binary-amd64/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/universe/binary-amd64/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/multiverse/binary-amd64/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/maya-security/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.184 80]
     
    W: Failed to fetch http://archive.canonical.com/ubuntu/dists/maya/partner/binary-amd64/Packages  404  Not Found [IP: 91.189.92.150 80]
     
    W: Failed to fetch http://archive.canonical.com/ubuntu/dists/maya/partner/binary-i386/Packages  404  Not Found [IP: 91.189.92.150 80]
     
    W: Failed to fetch http://packages.medibuntu.org/dists/maya/free/binary-amd64/Packages  404  Not Found
     
    W: Failed to fetch http://packages.medibuntu.org/dists/maya/non-free/binary-amd64/Packages  404  Not Found
     
    W: Failed to fetch http://packages.medibuntu.org/dists/maya/free/binary-i386/Packages  404  Not Found
     
    W: Failed to fetch http://packages.medibuntu.org/dists/maya/non-free/binary-i386/Packages  404  Not Found
     
    W: Some index files failed to download. They have been ignored, or old ones used instead.


Then when I open it, i can't see any availabe updates but it says I have 458 updates availabe.

Please feel free to ask me more questions about the issue. Thank you in advance!

[karlchen]

Hello, vaishaks.

I see the string "maya" next to Ubuntu web adresses. This suggests that there may be incorrect entries in your sources.list file. Please, run the command

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inxi -r

and post the screen output here.
Please, also run these commands and post the screen output as well

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lsb_release -a; uname -a

Kind regards,
Karl