In updating (an older computer with) Linux Mint 18.3 I tried to add the repository
deb https://cloud.r-project.org/bin/linux/ubuntu xenial-cran40/ as per the "Download R for Linux" instructions. This gave an error that there was no Release.key file. After some investigation, I found that deb https://cran.r-project.org/bin/linux/ubuntu xenial-cran40/ i.e., CRAN not CLOUD. With this change, I could install R 4.0. Is this a known glitch? JN ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.