try booting in windows, and resetting the modem to factory default with hardware flow control (ATZ4); then boot in ubuntu,
try deleting any minicom configuration you have (user and system-wide), and start minicom with "-s" (this way, minicom will not initialise the modem); then try to match minicom settings with your modem's configuration (flow control, ...).
try booting in windows, and resetting the modem to factory default with hardware flow control (ATZ4); then boot in ubuntu,
try deleting any minicom configuration you have (user and system-wide), and start minicom with "-s" (this way, minicom will not initialise the modem); then try to match minicom settings with your modem's configuration (flow control, ...).