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This happens on some of my Ubuntu servers but not all. I just did a fresh install of Ubuntu server 12.04 and when began to install updates, my 600kb/sec download speed is suddenly cut to 3kb/sec after several seconds.

This happens irregardless of whether I use a bandwidth-limiting client like wondershaper.

I believe that this is an Ubuntu problem, as none of my other servers are experiencing this, including servers running other distros.

Any help is greatly appreciated!

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This might sound like a silly question but how are you testing this? You're not just doing it by testing the repository speed, are you, as that is liable to slow down in busy times. – Oli Jul 20 '12 at 13:39
This happens when I issue apt-get install, aptitude update, aptitude safe-upgrade, etc. I would agree that repository speed can fluctuate, but this happens every single time I issue one of those commands. – divided Jul 20 '12 at 13:45

But the speed is constant (and high) with other tests? Try: wget -O /dev/null

If it's just the repos that are slow, change to a different mirror. Here is a particularly elegant solution for automatically picking the best mirror on a server: How can I get apt to use a mirror close to me, or choose a faster mirror?

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The speed test began around 500kb/sec and ended at 5.4kb/sec. – divided Jul 20 '12 at 15:12

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