I am unable to install rstudio-server. It is saying 'user' and 'group' already exists (please below), and I am not able to connect the server using url http:serveraddress:8787.
I am using Ubuntu server 'ubuntu 14.04'
RStudio is a set of integrated tools designed to help you be more productive with R. It includes a console, syntax-highlighting editor that supports direct code execution, as well as tools for plotting, history, and workspace management.
Do you want to install the software package? [y/N]:Y
(Reading database ... 313404 files and directories currently installed.)
Preparing to unpack rstudio-server-1.2.1572-amd64.deb ...
Unpacking rstudio-server (1.2.1572) over (1.2.1572) ...
Setting up rstudio-server (1.2.1572) ...
useradd: user 'rstudio-server' already exists
groupadd: group 'rstudio-server' already exists
rstudio-server start/spawned, process 9081