diff --git a/src/framework/core.c b/src/framework/core.c
index 98cfc26..097cb92 100644
--- a/src/framework/core.c
+++ b/src/framework/core.c
@@ -597,8 +597,8 @@ measure_speed_for_every_source (Source_t sources[], int size, double speed_recor
     {
       Source_t src = sources[i];
 
-      const SourceProvider_t *provider = src.provider;
-      const SpeedMeasureInfo_t smi = provider->smi;
+      SourceProvider_t *provider = src.provider;
+      SpeedMeasureInfo_t smi = provider->smi;
 
       bool skip = smi.skip;
 
@@ -621,18 +621,23 @@ measure_speed_for_every_source (Source_t sources[], int size, double speed_recor
         {
           if (xy_streql ("upstream", provider->code))
             {
-              // 上游源不测速，但不置0，因为要避免这种情况: 可能其他镜像站测速都为0，最后反而选择了该 upstream
+              /* 上游源不测速，但不置0，因为要避免这种情况: 可能其他镜像站测速都为0，最后反而选择了该 upstream */
               speed = -1024*1024*1024;
+              if (!src.url)
+                {
+                  smi.skip_reason_CN = "默认上游源URL未知，请帮助补充";
+                  smi.skip_reason_EN = "The default upstream source URL is unknown, please help to add";
+                }
             }
           else if (xy_streql ("user", provider->code))
             {
-              // 代码不会执行至此
+              /* 代码不会执行至此 */
               speed = 1024*1024*1024;
             }
           else
             {
-              // 什么情况?
-              speed = -1;
+              /* 不测速的 Provider */
+              speed = 0;
             }
           get_measured[i] = false;
           speed_records[i] = speed;
@@ -649,7 +654,11 @@ measure_speed_for_every_source (Source_t sources[], int size, double speed_recor
       else
         {
           const char *msg = CliOpt_InEnglish ? provider->abbr : provider->name;
-          measure_msgs[i] = xy_strjoin (3, "  - ", msg, " ... ");
+          if (xy_streql ("upstream", provider->code))
+            measure_msgs[i] = xy_strjoin (3, "  ^ ", msg, " ... ");
+          else
+            measure_msgs[i] = xy_strjoin (3, "  - ", msg, " ... ");
+
           printf ("%s", measure_msgs[i]);
           fflush (stdout);
 
diff --git a/src/framework/struct.h b/src/framework/struct.h
index c20ac0d..c70b8e5 100644
--- a/src/framework/struct.h
+++ b/src/framework/struct.h
@@ -14,10 +14,10 @@
 
 typedef struct SpeedMeasureInfo_t
 {
-  bool skip;                  /* 是否默认跳过 */
-  const char *skip_reason_CN; /* 跳过的原因（中文）*/
-  const char *skip_reason_EN; /* 跳过的原因（英文）*/
-  const char *url;            /* 测速链接 */
+  bool  skip;           /* 是否默认跳过 */
+  char *skip_reason_CN; /* 跳过的原因（中文）*/
+  char *skip_reason_EN; /* 跳过的原因（英文）*/
+  char *url;            /* 测速链接 */
 }
 SpeedMeasureInfo_t;
 
@@ -54,10 +54,10 @@ UserDefinedProvider = {
 typedef struct Source_t
 {
   union {
-    const SourceProvider_t *provider;
-    const MirrorSite_t     *mirror;
+    SourceProvider_t *provider;
+    MirrorSite_t     *mirror;
   };
-  const char *url;
+  char *url;
 }
 Source_t;
 
diff --git a/src/recipe/os/APT/Ubuntu.c b/src/recipe/os/APT/Ubuntu.c
index 375125f..734c49b 100644
--- a/src/recipe/os/APT/Ubuntu.c
+++ b/src/recipe/os/APT/Ubuntu.c
@@ -6,7 +6,7 @@
  * Contributors  :  Zhao  <1792582687@qq.com>
  *               |
  * Created On    : <2023-08-30>
- * Last Modified : <2024-11-21>
+ * Last Modified : <2024-11-22>
  * ------------------------------------------------------------*/
 
 /**
@@ -14,18 +14,18 @@
  */
 static Source_t
 os_ubuntu_sources[] = {
-  {&UpstreamProvider,      "http://archive.ubuntu.com/ubuntu/"}, //不支持https
-  {&MirrorZ,       "https://mirrors.cernet.edu.cn/ubuntu/"},
-  {&Ali,           "https://mirrors.aliyun.com/ubuntu"},
-  {&Volcengine,    "https://mirrors.volces.com/ubuntu"},
-  {&Bfsu,          "https://mirrors.bfsu.edu.cn/ubuntu"},
-  {&Ustc,          "https://mirrors.ustc.edu.cn/ubuntu"},
-  {&Tuna,          "https://mirrors.tuna.tsinghua.edu.cn/ubuntu"},
-  {&Tencent,       "https://mirrors.tencent.com/ubuntu"},
+  {&UpstreamProvider, "http://archive.ubuntu.com/ubuntu/"}, //不支持https
+  {&MirrorZ,          "https://mirrors.cernet.edu.cn/ubuntu/"},
+  {&Ali,              "https://mirrors.aliyun.com/ubuntu"},
+  {&Volcengine,       "https://mirrors.volces.com/ubuntu"},
+  {&Bfsu,             "https://mirrors.bfsu.edu.cn/ubuntu"},
+  {&Ustc,             "https://mirrors.ustc.edu.cn/ubuntu"},
+  {&Tuna,             "https://mirrors.tuna.tsinghua.edu.cn/ubuntu"},
+  {&Tencent,          "https://mirrors.tencent.com/ubuntu"},
   // {&Tencent_Intra, "https://mirrors.tencentyun.com/ubuntu"},
-  {&Huawei,        "https://mirrors.huaweicloud.com/ubuntu"},
-  {&Netease,       "https://mirrors.163.com/ubuntu"},
-  {&Sohu,          "https://mirrors.sohu.com/ubuntu"}
+  {&Huawei,           "https://mirrors.huaweicloud.com/ubuntu"},
+  {&Netease,          "https://mirrors.163.com/ubuntu"},
+  {&Sohu,             "https://mirrors.sohu.com/ubuntu"}
 };
 def_sources_n(os_ubuntu);
 
@@ -88,6 +88,11 @@ os_ubuntu_setsrc (char *option)
 {
   chsrc_ensure_root ();
 
+  // https://github.com/RubyMetric/chsrc/issues/121
+  SpeedMeasureInfo_t *upsmi = &UpstreamProvider.smi;
+  upsmi->skip = NotSkip;
+  upsmi->url = "http://archive.ubuntu.com/ubuntu/dists/noble/Contents-amd64.gz";
+
   if (chsrc_check_file (OS_Ubuntu_SourceList_DEB822))
     {
       char *msg = CliOpt_InEnglish ? "Will change source based on new format"