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Ubuntu 10.10 network connection works fine at the start, but few minutes later the network manager pops up a message saying disconnected you are offline and Chrome browser returns an error message like name not resolved.

This works fine in Windows 7. It was fine too in Ubuntu, until I updated it with 300 MB worth of updates.

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i'm using windows 7 now and this was happening in WiFi and Ethernet to reconnect i had to restart and enjoy 5 minutes of internet then disconnected and you are offline – ahmedsafan86 Mar 21 '11 at 15:22
It's hard to parse your English, and you mentioning Windows makes it look like the problem is there as well. So, please split your sentences with commas , and periods . next time. – Tshepang Mar 22 '11 at 11:08
Try to reproduce, and when it happens again, paste here the last several lines of /var/log/syslog. – Tshepang Mar 22 '11 at 11:13
If it's happening on both Windows and Ubuntu, it's probably a problem with your network equipment (router) or with your Internet provider. – Gilles Mar 22 '11 at 23:09

to work on Ubuntu, I would inspect the 300 MB uploads, what could be the cause, where a new kernel would be most suspicious.

If you still have the old kernel laying around and configured in grub, I would try to use these older kernels.

In synaptic, there is a history in the file menu. There you can probably reconstruct what was actualized when, together with the date of your posting.

ls -l /boot/vml*

will show you the age of kernels.

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