here is happening everytime after I click the Upgrade button at Update Manager fyi, my internet connection is ok because my Gwibber is always working and giving me the latest tweet and also i can surf well. but the internet connection always suddenly cut whenever I try to Upgrade.
2 Answers
Because Natty is just out, the servers are a bit crowded.
Consider the next traffic graph for the default Dutch Ubuntu mirror:
The traffic has been increased by four times because of the new Ubuntu release. Switching to a less used mirror improved the download speed for me. A list of mirrors, sorted by country, can be found at https://launchpad.net/ubuntu/+archivemirrors
I was getting that error a fair bit last night. Just try again. Eventually the download will succeed.