it's normal you need sudo to delete the configuration file in /etc.
if the following is literal: "cannot write to etc./minicom/minird.xxx", there
is an odd problem with the path ("etc./").
if it's not literal, you probably need to start minicom with sudo to make sure
it can write a file in /etc .
i still think this is crucial: "All I can say is that Minicom flashes
"Initializing modem" at first, and that the Minicom cursor usually
disappears when I'm typing the commands."; you should be able to locally
echo what you type in the minicom console. you don't know what minicom
is using for initialisation (hence the need to try running it without
any configuration file; initialisation with the wrong string would mess
things up).
since it doesn't work in wvdial or cutecom either, i agree the problem
is probably related to the serial port.
if you have a cd/dvd in this box, you could try the following: reset
your modem to defaults in windows; then boot the live dvd/cd installer
of ubuntu, don't reinstall but simply use the desktop environment,
install minicom in that environment (sudo apt-get install minicom; this
will work in the live environment) and try if that works. this would
rule out any misconfiguration by your hand.
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https://bugs.launchpad.net/bugs/1087519
Title:
Serial port ttyS4 doesn't work in 12.04
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