To upgrade R and RStudio type the following commands:
$sudo apt-get install libcurl4-openssl-dev $sudo apt-get install libxml2-dev $sudo add-apt-repository ppa:marutter/rrutter $sudo apt-get update $sudo apt-get upgrade $sudo apt-get install r-base r-base-dev
Now restart your Rstudio.
Note:
If you face any problem then type
install.packages(“<PackageName>”, dependencies=TRUE)