We created a small Ubuntu server on Linode, in order to use R + RStudio. Using the Linode guides, we installed R and installed RStudio. In the 2nd link, we're up to step 3 where we need to login to RStudio at <server-ip-address>:8787/. Similar to the user from this question, we're struggling to login.
To access the server, we are ssh'ing into the server using ssh root@<server-ip-address>, and then typing in our password our-password when prompted. So we have an IP address, and a password to access the server. I'm not sure what the user is for this server (root?, something else?). In addition to the IP and the server password, I also have a username and password to log into the company's Linode account.
What username / password should I be using to login to RStudio then on the server? root doesn't seem to work. nor did localhost, nor did my username for Linode.
Edit
Per https://support.rstudio.com/hc/en-us/articles/200552306-Getting-Started, it seems that RStudio will not permit logins by system users (which, with root, I think I am?)
After installing RStudio Server (e.g. with PUTTY) you should add a user. Have a look at this youtube video
ensure that you allocate admin-rights to the user in case you need to use the terminal in RStudio to install a package..