After that, I could use R in the command line, but I couldn't open Rstudio, either by typing 'rstudio' into the terminal or by clicking the icon from applications.
So I went back to the first guide and ran the commands in step two, but nothing changed. Right now, if I type 'rstudio' into the terminal I get this message: rstudio: error while loading shared libraries: libxslt.so.1: cannot open shared object file: No such file or directory
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package rstudio-xenial-1.1.463-amd64.deb
E: Couldn't find any package by glob 'rstudio-xenial-1.1.463-amd64.deb'
E: Couldn't find any package by regex 'rstudio-xenial-1.1.463-amd64.deb'
Because I could see the package in my downloads, I didn't understand what was going wrong. So, I tried to use the GDebi Package Installer, which didn't throw any errors, but when it finished it said status: same version already installed. But, I still can't seem to open Rstudio either from the command line or from applications.
I then uninstalled the package, which removed the rstudio icon from my applications, then reinstalled it, but with the same results.