W: Failed to fetch http://www.plexapp.com/repo/dists/lucid/InRelease  Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.
john@Master:~$ sudo apt-get install samba
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:
 samba : Depends: libwbclient0 (= 2:3.6.3-2ubuntu2.1) but 2:3.6.3-2ubuntu2.2 is to be installed
         Recommends: tdb-tools but it is not going to be installed
E: Unable to correct problems, you have held broken packages.