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Very sorry about this. There should be a paclet update soon to resolve this issue on Linux (WL v13.3). In the meantime, you could try renaming the underlying Examples library: e.g.: mv...
Please contact support, they should be able to provide you with a new CURLLink paclet that will likely address this issue.
@Diego Try `"\\.\COM10"` instead of `"COM10"` as a workaround. DeviceOpen["Serial", {"\\.\COM10", "BaudRate" -> 9600}]