Rstudio不能下载和更新第三方包

我最近在ubuntu18装了Rstudio,但不能下载第三方包,全局设置那里有一条警告说:CRAN repositories modified outside package preferences.
然后选择了中国的镜像也不能下载,在网上找了很多方法都不行,请问这个该怎么解决好呢?谢谢!


http://img1.mukewang.com/5e5cedb200018fe105920305.jpg

http://img.mukewang.com/5e5cedb2000170dc03620188.jpg


杰哒哒
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慕斯4360584

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慕斯4360584

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