First You have to install UbuDSL. Installing UbuDSL is pretty simple. First you have to download the latest stable version of UbuDSL from
UbuDSL. You need to unpack the deb package and it will install UbuDSL to your Ubuntu box. Then you need to follow the following steps to configure your ZTE ZXDSL 852 modem with UbuDSL.
1. Go to System > Administration and Open the UbuDSL Configuration panel
2. Then simply follow the instruction appears on your screen. For your simplicity, it is described below.
3. First, you need to unplug your ADSL modem, if it is already connected. Then click the next button at the bottom of the configuration window.
4. Then a second configuration screen will appear where you need to insert the username and password provided by your service provider (i.e. SLT). Then select Sri Lanka from the country drop down box which will automatically sets the service drop down box to SLT. Set the combo boxes given according to your preferences. I chose "OpenDNS" and "Start Connection while user plugs the modem" check boxes.
5. In the next screen, you will be asked to plug your modem and after that, install your Ubuntu CD to install the additional packages it needs. If the configuration window takes a lot of time to goes to the next step after you inserting the Ubuntu CD, you might have to manually install the required packages from the Ubuntu CD. This happens due to absence of additional packages that UbuDSL is looking for at the configuration time. If it is the problem with you, its worth checking
this linkout because it carries all the information that is required for a newbie like me to install the additional packages manually. After installing the additional packages manually, you need to again start from the step 1 to configure your modem. Others can proceed to fourth configuration screen where it asks you to reboot your system.
6. Now reboot the system and try to connect to the Internet using UbuDSL Applet. You can find it in Application > Internet. Hurrah... You just configured your ADSL connection correctly. Now enjoy surfing!!!
7. If you still have connection problems, please make sure that the /etc/modprobe.d/options file is configured correctly. You can open that file using the command "gksudo gedit /etc/modprobe.d/options". Locate the line starts with "options unicorn_usb_eth" and make sure it has something similar to "PROTOCOL=pppoe ENCAPS=lllc-encaps". Now you can reboot the system and start surfing!!! Enjoy!!!!!
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http://sanjrockzz.blogspot.com/2008/07/installing-zte-zxdsl-852-modem-driver.html
