Operation according to the blog is https://blog.csdn.net/Hogwarts091/article/details/89956856? Utm_source=app
Note after add mirror site save exit, update apt - get the update, there may be no public notification, then with reference to the blog at https://blog.csdn.net/loovejava/article/details/21837935? Utm_source=app installed you can suggest that the public key to
Then according to the steps to update the r language

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