Use Ubuntu with VirtualBox Behind Proxy

There seems to be problems with Ubuntu 9.04. It is possible to install from CD-ROM instead by using:

1. Press System → Administration → Software Sources.
2. Go to the Third Party Software tab and click on the Add CD-ROM button.
3. Insert the CD.

Do the following in your terminal prior to using apt-get:
export http_proxy=http://username:pword@HALPROXY1.flagship.hal.com:80