Cannot launch R help document from terminal R

My working platform is:

Distributor ID: Debian
Description:    Debian GNU/Linux 8.1 (jessie)
Release:    8.1
Codename:   jessie

I have installed vim-r-plugin for editing and running R programs. Everything looks fine but launch some R help document such as:

Does somebody know what’s the reason and how to fix it?

Answer

If you type getOption("help_type") it will be either "html" or "text". If it is "html" then it tries to open help in the browser. Here the browser it is trying to open doesn’t seem to exist. You can change the browser by typing the command options(browser = "firefox"). If you’re using Debian Jessie you might need to use options(browser = "iceweasel").

If you instead want to get help to display in the terminal, type options(help_type = "text").

To make your desired options happen automatically every time you start R, put your desired options() settings in your ~/.Rprofile.