我无法在R上安装任何软件包

Question

this is the error which is showing whenever i am trying to download any new package

我尝试使用CRANmirror（），但仍然无法正常工作

我对R完全陌生

这是文本格式的全部错误消息

install.packages("ggplot2")
Warning in install.packages :
  unable to access index for repository https://cloud.r-project.org/src/contrib:
  cannot open URL 'https://cloud.r-project.org/src/contrib/PACKAGES'
Installing package into ‘C:/Users/abc/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
  unable to access index for repository https://cloud.r-project.org/src/contrib:
  cannot open URL 'https://cloud.r-project.org/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘ggplot2’ is not available (for R version 4.0.2)
Warning in install.packages :
  unable to access index for repository https://cloud.r-project.org/bin/windows/contrib/4.0:
  cannot open URL 'https://cloud.r-project.org/bin/windows/contrib/4.0/PACKAGES'
Warning: unable to access index for repository https://cloud.r-project.org/src/contrib:
  cannot open URL 'https://cloud.r-project.org/src/contrib/PACKAGES'