Hey, @mr.raccoon
This does not seem quite right--I suspect you are getting confirmation you have the most updated version of RStudio.
Look at the console to determine what version of R you are using
What I found confusing using R with linux is that the base- R in the main repository is far behind. You have to get Base-R and updates from a specific repo.
You may find this post helpful.
Also here from a mint forum.
Once you get the updated version of base R you can most likely update the required packages.