That seems to be just a bug in gedit. If the backup option is checked (create a backup copy of files before saving), everything works properly. If that option is not selected, then you can save your modified file just once. Successive saving will cause the error.
Link to the message of the user who detected this issue: http://ubuntuforums.org/showpost.php?p=9248113&postcount=4 -- sshfs mounts read-only filesystems https://bugs.launchpad.net/bugs/557150 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs