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The error is returned because the GVFS SFTP backend does not allow opening files for simultaneous reading and writing (i.e. the O_RDWR flag to the open(2) system call). Such attempts return -EOPNOTSUPP, which is translated by VirtualBox to VERR_NET_OPERATION_NOT_SUPPORTED (which has the same meaning). You might have better luck with other GVFS backends (e.g. ...

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