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I was trying to install packages with synaptic. The internet connection cut off, and now is extremely unstable. It is not a problem with the internet connection itself because now I am on Windows.

How do I troubleshoot this?

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possible duplicate of Ubuntu internet connection is very unstable, all of a sudden – qbi Jan 15 '13 at 13:23
Although OP seems to have used another name to post. – user25656 Jan 15 '13 at 15:19
That was my post when I was panicked and back on Windows, before I came to my senses and signed in. Maybe the other post should be deleted. – Paul Jan 15 '13 at 15:23

How to troubleshoot networking problems? Google yields what looks like a good resource:

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Eliah Kagan Jan 15 '13 at 19:13
Whilst your comment is theoretically correct, I don't consider it sensible to post a general network troubleshooting guide here. – jdthood Jan 16 '13 at 9:14
It's true it shouldn't be posted verbatim: copyright problems, plus, answers should be customized to fit the question. But posting a general network troubleshooting guide here is what you did. You just posted it as a link that can change without warning. It seems to me this has the disadvantages of a general guide, and only some of the advantages. In particular, if a general guide would be considered off-topic on Ask Ubuntu, so would this. (But I don't think it would--so long as it's geared toward Ubuntu users.) Anyway, it's your choice, though someone may choose to expand this themselves. – Eliah Kagan Jan 16 '13 at 10:36

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