错误：找不到满足<软件包名称>要求的版本

Question

我正在尝试在使用Ubuntu Mate的raspberry pi 3B +中安装python模块。对于大多数模块，我始终会遇到以下错误

  

错误：找不到满足要求的版本

例如，我尝试了以下代码：

$baseUrl=\yii\helpers\Url::base(true);
$js=<<<JS
 $(document).on('click','.btn-block',function(e){
    var id = $(this).parents('.user-tr').attr('id');
    let data={id : id};
    data[yii.getCsrfParam()]=yii.getCsrfToken();

    $.ajax({
        url: '{$baseUrl}/admin/block-users',
        type: 'POST',
        data: data,
        success: function (data) {
            console.log(data);
            },
        });
    })
JS;
$this->registerJs($js, View::POS_READY);

不仅是此软件包，而且还有pip install functools_lru_cache Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting functools_lru_cache ERROR: Could not find a version that satisfies the requirement functools_lru_cache (from versions: none) ERROR: No matching distribution found for functools_lru_cache ，pip install backports等。请帮助!!!