N: See apt-secure(8) manpage for repository creation and user configuration details. N: Updating from such a repository can't be done securely, and is therefore disabled by default. W: GPG error: focal-cran40/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9Į: The repository ' focal-cran40/ InRelease' is not signed. The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9 If I run sudo apt- get update, I get the following message: Hit:1 focal InRelease I do recall having some error messages when installing R, which may be the cause. The next major release of R) is available in the r-devel snapshot build.I was wondering how I can update R on Rstudio server, as I don't have the latest version of R.
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