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Since I upgraded to Oneiric apt-get seems to ignore my architecture and gets the sources for both, amd64 AND i386, files from the repositoreis. this leads to constant "duplicate source entries" errors.

What to do?

**EDIT: Information provided by dizzy

Here is the requested file (since I'm not allowed to post more than two URLs I've modified the URLs not to be recognized (to std url / http:// to ..):

deb *std url* oneiric main restricted

deb *std url* oneiric-updates main restricted

deb *std url* oneiric universe
deb *std url* oneiric-updates universe

deb *std url* oneiric multiverse
deb *std url* oneiric-updates multiverse

deb oneiric partner

deb *std url* oneiric-security main restricted
deb *std url* oneiric-security universe
deb *std url* oneiric-security multiverse

deb oneiric contrib # disabled on upgrade to oneiric

deb oneiric main #Third party developers repository
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Can you add the content of /etc/apt/sources.list to your question? – Jorge Castro Oct 14 '11 at 12:28
up vote 3 down vote accepted

They enabled multiarch support in Oneiric, which breaks aptitude, see this bug entry on launchpad:

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protected by Community Oct 19 '11 at 15:42

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