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Vodafone umts usb modem on Linux

We purchased a hsdpa usb vodafone modem to access the umts network of Belgacom.
This is a Huawei E620 model, you can do a 'lsusb' to find out about yours.
Fortunately there exists a driver for this stick.
On our ubuntu system we needed to do a 'apt-get -f install' after attempting to install the driver.
After that the installation was straightforward.