当我尝试安装某些东西时，它给了我这个错误：
HTTP request sent, awaiting response... 403 Forbidden
2014-04-23 09:32:53 ERROR 403: Forbidden.
download failed
Oracle JDK 7 is NOT installed........
但我安装了 Oracle JDK 7：
mostafa@mostafa-EP31-DS3L:~$ sudo update-alternatives --config java
0 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 manual mode
\* 2 /usr/lib/jvm/java-7-oracle/jre/bin/java 1 manual mode
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有什么问题，我该如何解决？