I recently updated RStudio on my Mac to v. 3.6.2 and now realize I have been unable to install any packages, including ggplot2. I have tried many of the solutions suggested on this forum and nothing has worked. I'm not sure what else to do.
install.packages("ggplot2") wasn't working either. But it appears everything is working again now? It must have just been a coincidence that I upgraded to v.3.6.2 today and everything stopped working.