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I'm not able to install VLC Media Player, or even update my computer. I get

This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.

Then I click More Details and get

The following packages have unmet dependencies:

vlc: Depends: vlc-nox (= 2.0.8-0ubuntu0.13.04.1) but 2.0.8-0ubuntu0.13.04.1 is to be installed
Depends: libavcodec-extra-53 (>= 6:0.8.6) but it is not going to be installed
Depends: libavutil-extra-51 (>= 6:0.8.6) but it is not going to be installed
Depends: libc6 (>= 2.15) but 2.17-0ubuntu5 is to be installed
Depends: libfreetype6 (>= 2.2.1) but 2.4.11-0ubuntu1 is to be installed
Depends: libgcc1 (>= 1:4.1.1) but 1:4.7.3-1ubuntu1 is to be installed
Depends: libqtcore4 (>= 4:4.8.0) but 4:4.8.4+dfsg-0ubuntu9.3 is to be installed
Depends: libqtgui4 (>= 4:4.7.0~beta1) but 4:4.8.4+dfsg-0ubuntu9.3 is to be installed
Depends: libsdl-image1.2 (>= 1.2.10) but it is not going to be installed
Depends: libstdc++6 (>= 4.6) but 4.7.3-1ubuntu1 is to be installed
Depends: libtar0 but it is not going to be installed
Depends: libva-x11-1 (> 1.0.15~) but it is not going to be installed
Depends: libxcb-keysyms1 (>= 0.3.9) but it is not going to be installed
Depends: zlib1g (>= 1:1.2.3.3) but 1:1.2.7.dfsg-13ubuntu2 is to be installed

How can I fix this? Thanks.

When I update the system using Terminal, I get

Fetched 817 kB in 29s (27.7 kB/s)
N: Ignoring file 'duinsoft.listsudo' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
W: GPG error: http://www.duinsoft.nl debs Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E18CE6625CB26B26
W: GPG error: http://us.archive.ubuntu.com raring Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: Failed to fetch http://ppa.launchpad.net/screenlets/...amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/screenlets/...-i386/Packages 404 Not Found

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

Sources List

# deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)]/ raring main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ raring main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ raring main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ raring-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ raring-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ raring universe
deb-src http://us.archive.ubuntu.com/ubuntu/ raring universe
deb http://us.archive.ubuntu.com/ubuntu/ raring-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ raring-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ raring multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ raring multiverse
deb http://us.archive.ubuntu.com/ubuntu/ raring-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ raring-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu raring-security main restricted
deb-src http://security.ubuntu.com/ubuntu raring-security main restricted
deb http://security.ubuntu.com/ubuntu raring-security universe
deb-src http://security.ubuntu.com/ubuntu raring-security universe
deb http://security.ubuntu.com/ubuntu raring-security multiverse
deb-src http://security.ubuntu.com/ubuntu raring-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu raring partner
# deb-src http://archive.canonical.com/ubuntu raring partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu raring main
deb-src http://extras.ubuntu.com/ubuntu raring main
deb http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu precise main
# deb-src http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu precise main

AFTER FOLLOWING INSTRUCTION

W: GPG error: http://www.duinsoft.nl debs Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E18CE6625CB26B26
W: Failed to fetch http://ppa.launchpad.net/screenlets/ppa/ubuntu/dists/raring/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/screenlets/ppa/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead. cyberproxy@Paradox:~$ sudo apt-get install -f [sudo] password for cyberproxy: Reading package lists... Done Building dependency tree
Reading state information... Done The following packages were automatically installed and are no longer required: efibootmgr grub-efi-amd64-bin kde-l10n-engb Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. N: Ignoring file 'duinsoft.listsudo' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension cyberproxy@Paradox:~$

share|improve this question
    
When you say "when I update the system" you mean sudo apt-get update ? –  PeppeDAlterio Sep 14 '13 at 17:29
    
Yes. Nor can I install VLC Media Player, etc. –  Mike Kuplevatsky Sep 14 '13 at 18:04
    
Please provide this file: /etc/apt/sources.list You can use sudo cat /etc/apt/sources.list to do this. –  PeppeDAlterio Sep 14 '13 at 18:19
    
Edited the original question and submitted list. –  Mike Kuplevatsky Sep 14 '13 at 18:25
    
Answer edited, it didn't work, still. –  Mike Kuplevatsky Sep 14 '13 at 19:05

1 Answer 1

Try deleting your apt list, and make a new one:

Delete the old list:
sudo rm -r /var/lib/apt/lists && sudo mkdir -p /var/lib/apt/lists/partial

Generate a new one:
sudo apt-get update

Now you should be able to install the missing dependencies by running:
sudo apt-get install -f

share|improve this answer
    
I still got an error at the end –  Mike Kuplevatsky Sep 14 '13 at 19:07
    
Yep, but you should now be able to install VLC. Just try sudo apt-get install vlc –  PeppeDAlterio Sep 14 '13 at 19:08
    
Will I be able to get updates from Ubuntu Software Updater? Or sudo apt-get update? –  Mike Kuplevatsky Sep 14 '13 at 19:25
    
I tried updating, but it told me "Failed to download respiratory information." –  Mike Kuplevatsky Sep 14 '13 at 19:28
    
This file "duinsoft.listsudo" has a wrong name, rename it into "duinsoft.list". You can do this running: sudo mv /etc/apt/sources.list.d/duinsoft.listsudo /etc/apt/sources.list.d/duinsoft.list. Now run sudo apt-get update again . Anyway update does NOT update your system, it just re-synchronize the package index files from their sources. To "update your system" you have to run: sudo apt-get upgrade –  PeppeDAlterio Sep 14 '13 at 19:32

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