无法为 R 4.1 安装 R 包

Question

I am unable to install any R packages today. The issue did not happen until last week (the last time I use the command). My laptop system is a Windows 10, and I am not using any local network/proxy/work Internet, so pretty sure it is not the proxy server or firewall issue. I updated my R, restart the program and the computer, no help.

Here is the error message.

Warning in install.packages : unable to access index for repository http://cran.rstudio.com/src/contrib : cannot open URL 'http://cran.rstudio.com/src/contrib/PACKAGES'

Here are the methods I have tried from the Internet but did NOT work:

1. Update the CRAN Repository for installing packages
2. Uncheck the "Use secure download method for HTTP" and "Use Internet Explorer library/proxy for HTTP" options
3. Run R as administrator
4. Change the library to install packages
5. Use the install.packages('package_name', dependencies=TRUE, repos='http://cran.rstudio.com/')

Again, I am pretty sure there is no firewall/proxy issue, as I never had the problem until last week, using the same Internet and the same device. Does anyone have ideas? Thanks in advance for the help!

Answer 1

The issue was eventually solved by options(download.file.method="libcurl") .

Following another suggested answer, I tried options(repos = "http://cran.rstudio.com/") but got the below message:

Warning message: In download.file(mirrors_csv_url, destfile = mirrors_csv, quiet = TRUE) : InternetOpenUrl failed: 'ìÂs°þ$'

Then the answer to this question did the trick.