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What version of dpkg are you using? Could it be this problem?
dpkg (1.17.5) unstable; urgency=low
[ Guillem Jover ]
[...]
* Fix segfault in update-alternatives when adding or renaming slaves for
an existing alternative. Regression introduced in dpkg 1.17.2.
Closes: #731710
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dpkg 1.16.12 from jessie/testing<BR>
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Brent
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