Duplicate sources.list entry

Hello, I'm seeing a warning message in the Syslog about duplicate sources.list entry:
http://ftp.uk.debian.org/debian/ wheezy/main amd64 Packages (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_wheezy_main_binary-amd64_Packages)

I'm currently seeing this message in OMV 2.1 but I did see it previously in OMV 1.18

Can someone please tell me how to remove this warning message?

Thanks

Thanks Ryecoaaron, I ran the omv-mkconf omvextrasorg aptclean command but I still see the warning message.

There is the sources.list

#


# deb cdrom:[Debian GNU/Linux 6.0.0 _Squeeze_ - Official Snapshot amd64 LIVE/INS                      TALL Binary 20140520-18:28]/ wheezy main non-free


#deb cdrom:[Debian GNU/Linux 6.0.0 _Squeeze_ - Official Snapshot amd64 LIVE/INST                      ALL Binary 20140520-18:28]/ wheezy main non-free


deb http://ftp.uk.debian.org/debian/ wheezy main
deb-src http://ftp.uk.debian.org/debian/ wheezy main


deb  http://ftp.uk.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.uk.debian.org/debian/ wheezy main contrib non-free


deb http://security.debian.org/ wheezy/updates main non-free
deb-src http://security.debian.org/ wheezy/updates main non-free


# wheezy-updates, previously known as 'volatile'
deb http://ftp.uk.debian.org/debian/ wheezy-updates main non-free
deb-src http://ftp.uk.debian.org/debian/ wheezy-updates main non-free

Thanks ryecoaaron, I followed the instructions and my sources.list now just has the 3 entries.
However, I now have a more serious issue as I can't get into OMV. Known of the OMV commands are recognised.
I see some error messages at boot time but I can't find them when I do a dmesg.
I think I must have done something seriously wrong. Do you think that I need (somehow) to re-install OMV?
Should I start a new thread for this issue?

Many thanks

cat /etc/apt/sources.list

deb http://ftp.uk.debian.org/debian stable main contrib non-free


deb http://ftp.debian.org/debian/ wheezy-updates main contrib non-free


deb http://security.debian.org/ wheezy/updates main contrib non-free

dpkg -l | grep openmediavault

rc  openmediavault                 2.1                           all          Open network attached storage solution
rc  openmediavault-extplorer       1.1                           all          OpenMediaVault eXtplorer plugin
ii  openmediavault-keyring         0.3                           all          GnuPG archive keys of the OpenMediaVault archive
rc  openmediavault-minidlna        1.0.11                        all          OpenMediaVault miniDLNA (DLNA server) plugin
rc  openmediavault-omvextrasorg    1.29                          all          OMV-Extras.org Package Repositories for OpenMediaVault
pc  openmediavault-owncloud        1.1.3                         all          OpenMediaVault ownCloud plugin
[/font]

I don't use ownCloud now.

It appears I have some some unmet dependencies and broken packages.

root@openmediavault:~# apt-get install openmediavault
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:


The following packages have unmet dependencies:
 openmediavault : Depends: php5-pam but it is not going to be installed
                                            Depends: proftpd-mod-vroot but it is not going to be installed
                                            Depends: php5-proctitle but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Yikes!! It is 8.1, so somehow I selected it, but I don't understand how I did.

Thank you for you support ryecoaaron, I really appreciate it.

So what is the best way to reinstall and preserve the data that I already have on the media disks?

Many thanks

I'm having a problem here. I've burnt the OMV 2.1 code onto a USB stick. This is how I installed OMV originally. However, this time the installation process it is trying to detect (and not finding) common CD-ROM drivers. I don't have a CD drive on my system so I'm wondering how to overcome the issue. I can't progress with the installation until I overcome the issue with CD-ROM drivers.

I did see a forum post with the same issue as me (for an earlier release) but it appears to be connected with an issue for a USB keyboard. My USB keyboard works okay.

Any clues/comments?

Many thanks

hmm, as the saying goes, if at first you do not succeed ... well I tried a different route this time and pressed F12 to choose my boot preference and it worked! OMV 2.1 is installed running on Debian 7.8.
I did some messages about array setup but it didn't stop the installation.

Anyway thanks to ryecoaaron and Wastlj for your help.