Hi all.

> 
> It looks a bit like a broken /etc/apt/preferences file. Try
> removing/renaming this and retry.

Well .. maybe not 'broken' .. but just 'configured':

on SL3/4 apt preferences file is setup to prefer SL3/4
'base' repository over add-on third-party ones.

If user wants to change this I would suggest editing this
file and setting up the desired preference order .. instead
of removing it all together ..

Cheers

Jarek

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