Installing R-4.0 on Ubuntu 18.04 painlessly

There are some great instructions here but there are a few gotchas to be aware of. Follow these instructions first, and it will make the process a LOT easier:

1. Make sure you have these dependancies installed. If you don't, you're going to have trouble installing any R packages like R curl, tidyverse, devtools, etc

sudo apt install libssl-dev libcurl4-openssl-dev libxml2-dev

2. Remove any existing R install.

sudo apt remove r-base* --purge

3. Remove any remaining packages. It's better to install them "fresh". They will be in locations like /home/user/R/R-3.6.6 and /usr/lib/R/library/

4. Remove any existing entry for R in the etc/apt/sources.list to install an older R version.

sudo nano /etc/apt/sources.list

For example you might have something like this:

deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/

5. Then follow the DigitalOcean instructions here and you should be set up in just a few minutes.
Location: Laverton VIC 3028, Australia

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