Complete remove and reinstall R, including all packages

Question

After some heavy tinkering, I must have screwed up my R installation and some package permissions. Rather than try to fix it, I just want to wipe and reinstall everything. So I

Answer 1

In R, you can use the .libPaths() instruction (or R -e '.libPaths()' in terminal) to know where your packages are installed. Delete those folders and reinstall.