Unable to extract 7z archive

[DoubleA]

First time linux user here. Just installed Mint 14 KDE & unable to extract all 7z archives. Any tips will be very much appreciated. Thanks in advance.

[xenopeek]

To clarify; you are able to extract some 7z archives, but not some others? is there anything special about those, like do they have a password or something?

[DoubleA]

None of the .7z files can be extracted at all. ZIP files extracted fine though. All archive files was created in WinXP with 7-zip.

[xenopeek]

Okay, gotcha Seems 7z support is not preloaded on the KDE version, but you can easily fix that. Install the package p7zip-full to add full support for 7z files. Either use Software Manager or Synaptic to install it, or do:

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apt install p7zip-full

[DoubleA]

Below is the output from the console :-

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phoebe@phoebe-ThinkPad-T60 /media/280GB $ apt install p7zip-full
[sudo] password for phoebe:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package p7zip-full is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source


Another thing which I think might be ralated is that the 'Update Manager' seems to have some problem retrieving packages from the source as it shows the error below :-

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Failed to fetch http://archive.canonical.com/ubuntu/dists/nadia/partner/binary-i386/Packages  404  Not Found [IP: 91.189.92.150 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/nadia-security/main/binary-i386/Packages  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/nadia-security/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/nadia-security/universe/binary-i386/Packages  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/nadia-security/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://packages.medibuntu.org/dists/nadia/free/binary-i386/Packages  404  Not Found
Failed to fetch http://packages.medibuntu.org/dists/nadia/non-free/binary-i386/Packages  404  Not Found
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia-updates/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia-updates/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia-updates/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/nadia-updates/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Some index files failed to download. They have been ignored, or old ones used instead.

[xenopeek]

Something is wrong with your repositories, with you using the Linux Mint release name on the Ubuntu repositories (those expect a Ubuntu release name). The following command should correct this:

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sudo sed -i 's/nadia/quantal/' /etc/apt/sources.list.d/medibuntu.list /etc/apt/sources.list.d/ubuntu.list

Then update your repositories manually:

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apt update

If there are any errors remaining, please share those here and include also the output of:

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inxi -r

If no more errors, go ahead and try again to install p7zip-full.