如何在Rstudio anaconda

Question

终端（3.5.1）中的R-我使用Linux-与RStudio Anaconda（3.5.0）上的版本不同。

RStudio 1.1.456已更新。

> install.packages('devtools')
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/src/contrib:
  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/src/contrib:
  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘devtools’ is not available (for R version 3.5.0)

所以我不能使用updateR（）