Detect 64 bit linux and download proper binary when checking for updates.

src/net/java/sip/communicator/plugin/updatechecker/UpdateCheckActivator.java

@@ -168,6 +168,11 @@ public void actionPerformed(ActionEvent e)
 
                 public void actionPerformed(ActionEvent e)
                 {
+                    if(isLinux64())
+                    {
+                        downloadLink = downloadLink.replace("i386", "amd64");
+                    }
+
                     getBrowserLauncher().openURL(downloadLink);
                     dialog.dispose();
                 }
@@ -661,6 +666,21 @@ protected PasswordAuthentication getPasswordAuthentication()
         });
     }
 
+    /**
+     * Checks whether we are running on 64 bit Linux.
+     * (Not really a correct check as if we are running a 32bit jvm
+     * on 64bit linux it will report 32bit).
+     * @return is Linux 64bit.
+     */
+    private static boolean isLinux64()
+    {
+        String osName = System.getProperty("os.name");
+        String arch = System.getProperty("sun.arch.data.model");
+
+        return (osName != null) && (arch != null) && (osName.indexOf("Linux") != -1)
+            && (arch.indexOf("64") != -1);
+    }
+
     /**
      * The menu entry under tools menu.
      */