Octave 如何修复ubuntu八度音阶上的xlsread错误

我正在尝试读取一个简单的xls文件，其中xlsread为八度。其csv版本如下所示：

2,4,6
8,10,12
14,16,18
20,22,24

我已在倍频程中运行以下命令：

# the next commands are to select the file through a gui.
# it reports a warning, but selects the filename correctly
>> pkg load io
>> fprintf('Select the training data file ... \n');
Select the training data file ...
>> filename = uigetfile({'*.xls'; '*.xlsx'}, 'File Selector');
Gtk-Message: 14:37:32.971: GtkDialog mapped without a transient parent. This is discouraged.
>> printf('file name %s\n', filename);
file name x1.xls

# now I am trying to read the xls, and I get an error:
>> [~, ~, RAW] = xlsread(filename);
Detected XLS interfaces: None.
warning: xlsopen.m: no '.xls' spreadsheet I/O support with available interfaces.
warning: xlsread: some elements in list of return values are undefined
warning: called from
    xlsread at line 268 column 1

---

我正在ubuntu-18.04 LTS上使用octave-4.2.2。这个错误的原因是什么？是否有其他软件包需要安装？如何解决此问题？

倍频程支持xlsx，而不是xls。

您能否提供有关如何解决此问题的更多详细信息？然后我会接受你的答案，如果它对我有效。只需手动转换XLS文件。我用LibreOffice做的。