Warning in install.packages("ggplot2") :
'lib = "C:/Program Files/R/R-3.5.2/library"' is not writable
Error in install.packages("ggplot2") : unable to install packages
Check in this web site, there are more solutions
Are you on a work computer or something where you can't write on the C drive? Even then it seems strange.
If you want to install into the system level package library, you have to run Rstudio as "administrator", otherwise, you have to install into your user level package library.
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