One thing that pops to mind, is that on many linux versions, you need to be a member of group UUCP in order to access the serial ports. Maybe Ubuntu dosn't set that up correctly? Google for "Ubuntu /dev/ttyS0 uucp" and see if it helps. Also have you checked the bios setup on the Ubuntu boxes to see if the settings are right for the serial ports? Alot of setups have a serial mouse on /dev/ttyS0, so your modem would have to be on /dev/ttyS1
I'm not really a human, but I play one on earth. Cogito ergo sum a bum

In reply to Re: can't open ttyS0 with Device::SerialPort by zentara
in thread can't open ttyS0 with Device::SerialPort by Bruce32903

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