diff --git a/FastGithub.HttpServer/CaCertInstallerOfLinux.cs b/FastGithub.HttpServer/CaCertInstallerOfLinux.cs
index 12ceab3..12af24a 100644
--- a/FastGithub.HttpServer/CaCertInstallerOfLinux.cs
+++ b/FastGithub.HttpServer/CaCertInstallerOfLinux.cs
@@ -53,6 +53,7 @@ namespace FastGithub.HttpServer
             }
             catch (Exception ex)
             {
+                File.Delete(destCertFilePath);
                 logger.LogWarning(ex.Message, "自动安装证书异常");
             }
         }
@@ -63,21 +64,22 @@ namespace FastGithub.HttpServer
         /// </summary>
         /// <param name="name"></param>
         /// <returns></returns>
-        protected bool IsReleasName(string name)
+        protected static bool IsReleasName(string name)
         {
             if (File.Exists(OS_RELEASE_FILE) == false)
             {
                 return false;
             }
 
-            var releaseLines = File.ReadAllLines(OS_RELEASE_FILE);
-            if (releaseLines.Length == 0)
+            foreach (var line in File.ReadAllLines(OS_RELEASE_FILE))
             {
-                return false;
+                if (line.StartsWith("NAME=") && line.Contains(name))
+                {
+                    return true;
+                }
             }
 
-            var nameLine = releaseLines[0];
-            return nameLine.Contains(name);
+            return false;
         }
     }
 }
\ No newline at end of file
diff --git a/FastGithub.HttpServer/CaCertInstallerOfLinuxCentOS.cs b/FastGithub.HttpServer/CaCertInstallerOfLinuxCentOS.cs
index 1600670..3ed7031 100644
--- a/FastGithub.HttpServer/CaCertInstallerOfLinuxCentOS.cs
+++ b/FastGithub.HttpServer/CaCertInstallerOfLinuxCentOS.cs
@@ -10,7 +10,7 @@ namespace FastGithub.HttpServer
         /// <returns></returns>
         public override bool IsSupported()
         {
-            return OperatingSystem.IsLinux() && base.IsReleasName("CentOS");
+            return OperatingSystem.IsLinux() && IsReleasName("CentOS");
         }
     }
 }
\ No newline at end of file
diff --git a/FastGithub.HttpServer/CaCertInstallerOfLinuxDebian.cs b/FastGithub.HttpServer/CaCertInstallerOfLinuxDebian.cs
index 3a7cf08..802fdf9 100644
--- a/FastGithub.HttpServer/CaCertInstallerOfLinuxDebian.cs
+++ b/FastGithub.HttpServer/CaCertInstallerOfLinuxDebian.cs
@@ -14,7 +14,7 @@ namespace FastGithub.HttpServer
         /// <returns></returns>
         public override bool IsSupported()
         {
-            return OperatingSystem.IsLinux() && base.IsReleasName("Debian");
+            return OperatingSystem.IsLinux() && IsReleasName("Debian");
         }
     }
 }
\ No newline at end of file
diff --git a/FastGithub.HttpServer/CaCertInstallerOfLinuxRedHat.cs b/FastGithub.HttpServer/CaCertInstallerOfLinuxRedHat.cs
index 28f908f..cfa0441 100644
--- a/FastGithub.HttpServer/CaCertInstallerOfLinuxRedHat.cs
+++ b/FastGithub.HttpServer/CaCertInstallerOfLinuxRedHat.cs
@@ -14,7 +14,7 @@ namespace FastGithub.HttpServer
         /// <returns></returns>
         public override bool IsSupported()
         {
-            return OperatingSystem.IsLinux() && base.IsReleasName("Red Hat");
+            return OperatingSystem.IsLinux() && IsReleasName("Red Hat");
         }
     }
 }
\ No newline at end of file
diff --git a/FastGithub.HttpServer/CaCertInstallerOfLinuxUbuntu.cs b/FastGithub.HttpServer/CaCertInstallerOfLinuxUbuntu.cs
index d94b3e1..fa0371a 100644
--- a/FastGithub.HttpServer/CaCertInstallerOfLinuxUbuntu.cs
+++ b/FastGithub.HttpServer/CaCertInstallerOfLinuxUbuntu.cs
@@ -10,7 +10,7 @@ namespace FastGithub.HttpServer
         /// <returns></returns>
         public override bool IsSupported()
         {
-            return OperatingSystem.IsLinux() && base.IsReleasName("Ubuntu");
+            return OperatingSystem.IsLinux() && IsReleasName("Ubuntu");
         }
     }
 }
\ No newline at end of file