我刚刚更新了here所示的R版本，现在无法使用我的软件包。我试图删除并重新安装它们，但仍然出现错误。例如，尝试安装tidyverse会给我
install.packages("tidyverse")
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/src/contrib:
internet routines cannot be loaded
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/src/contrib:
internet routines cannot be loaded
Warning in install.packages :
package ‘tidyverse’ is not available (for R version 4.0.0)
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/4.0:
internet routines cannot be loaded
我发现了this个问题，但答案中的步骤没有帮助。有些步骤不适用于我的情况，尝试运行某些步骤会导致完全相同的错误。