So it's generally better to let your users choose which version of R to use. The reason for this recommendation is that once you update R, some of your older scripts could potentially break. In general we recommend you don't use apt install to update R, but to install multiple versions of R side-by-side, using the instructions at RStudio Install R - RStudio Documentation 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. Follow How To Install Nginx on Ubuntu 20.04 to install Nginx. Nginx installed with access to ports 80 and 443. The latest version of R, which you can install with Step 1 of How To Install R on Ubuntu 20.04. Download RStudio Server for Debian & Ubuntu. I was wondering how I can update R on Rstudio server, as I don't have the latest version of R. An Ubuntu 20.04 server with a sudo non-root user and a firewall, which you can set up by following the Ubuntu 20.04 initial server setup guide.
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