After installing 11.04 alpha2, I cannot access the internet.
I use wireless LAN. In the network connection dialog, it seems to work well, but I cannot access any webpages from my webbrowser even if I use direct ip address (so it is not a DNS problem).
I cannot download a newer version from update-manager. That doesn't work either.
Can I roll back the update? I'm so frustrated and regretful.
Unlike Windows Ubuntu doesn't create system restore points to 'rollback' to.
You would have to reinstall 10.10 from scratch but you can back up your data in your /home directory and start over.
Natty is only an Alpha release and not recommended for a production install - you'd be better off to install it onto a USB stick and run a live version to test and report bugs.