Thanks for your report.
The errors are
Verbindung mit ubuntu.intergenia.de:http nicht möglich
This is caused by a network error probably your mirror is overloaded.
You can try again later of try another mirror.
I'm closing this report because it is not a bug with Ubuntu.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/772615
Title:
upgrade to 11.04 failed
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