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Winmodems
Most winmodems are not supported by Ubuntu, but drivers can be found that will enable the use of such modems. First you need to identify what chipset your winmodem is using:
wget -c http://linmodems.technion.ac.il/packages/scanModem.gz gunzip -c scanModem.gz > scanModem chmod +x scanModem sudo ./scanModem gedit Modem/ModemData.txt
Read this file, it should list what modem chipset you have. Once you are aware of the chipset you have, see http://www.linmodems.org/ and follow the directions for your modem.
More infomation can be found at SettingUpModems on the Ubuntu Wiki.
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