Question: After installing R and RStudio in Ubuntu 16.04 with the following code:

```
sudo apt-get update
sudo apt-get install r-base
sudo apt-get install r-base-dev

```

and

```
sudo apt-get install gdebi-core
wget https://download1.rstudio.org/rstudio-1.0.143-amd64.deb
sudo gdebi rstudio-1.0.143-amd64.deb

```

I am trying to install packages and I am getting errors in R console like

```
install.packages("fGarch")
Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
Warning in install.packages :
  'lib = "/usr/local/lib/R/site-library"' is not writable
```

As I am new in Linux I do not know in which directory install the R packages.
I am not sure whether this is the problem or if I did any mistake on the installation. Can anyone help me with this issue? Thanks in advance.

Answer: 
I don't know why R 3.4.1 changes the library path. To change it back, simply edit `/etc/R/Renviron`: 

```
$ sudo gedit /etc/R/Renviron

```

Comment-out `R_LIBS_SITE=...` then uncomment `R_LIBS_USER=...` 

```
# edd Jun 2017  Comment-out R_LIBS_USER
R_LIBS_USER=${R_LIBS_USER-'~/R/x86_64-pc-linux-gnu-library/3.4'}

# edd Apr 2003  Allow local install in /usr/local, also add a directory for
#               Debian packaged CRAN packages, and finally the default dir 
# edd Jul 2007  Now use R_LIBS_SITE, not R_LIBS
#R_LIBS_SITE=${R_LIBS_SITE-'/usr/local/lib/R/site-library:/usr/lib/R/site-library:/usr/lib/R/library'}  

```
Try opening up R through the terminal under **sudo**. This will require you typing in your password and will allow you to give permissions to write over files in your system. [Picture](https://i.stack.imgur.com/ceVfa.png)

Edit: See picture for clarity