Problems with loading ggplot2

You need dependencies = TRUE. Exit and re-open RStudio then run this

install.packages("ggplot2", dependencies = TRUE, repos = "http://cran.us.r-project.org")

I usually use pacman package to manage my packages. It will check if packages are already existed. If not, it will install and load the missing ones
https://cran.r-project.org/web/packages/pacman/vignettes/Introduction_to_pacman.html

Cheers

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