How to install Swirl on ubuntu 16.04?

Hi Team,rr

I am not able to install swirl on my ubuntu 16.04 system i am getting an error like -

* DONE (openssl)
ERROR: dependency ‘curl’ is not available for package ‘httr’
* removing ‘/home/sonu/R/x86_64-pc-linux-gnu-library/3.2/httr’
ERROR: dependency ‘httr’ is not available for package ‘swirl’
* removing ‘/home/sonu/R/x86_64-pc-linux-gnu-library/3.2/swirl’

The downloaded source packages are in
 ‘/tmp/RtmpVcFQtj/downloaded_packages’
Warning messages:
1: In install.packages("swirl") :
  installation of package ‘curl’ had non-zero exit status
2: In install.packages("swirl") :
  installation of package ‘httr’ had non-zero exit status
3: In install.packages("swirl") :
  installation of package ‘swirl’ had non-zero exit status