Error when running apt-get update on ubuntu 14

ubuntu-14.04

I am running ubuntu 14 on one of my servers.

When I run sudo apt-get update, I get the error below. 

W: GPG error: http://cran.rstudio.com trusty/ Release: The following signatures were invalid: KEYEXPIRED 1445181253 KEYEXPIRED 1445181253 KEYEXPIRED 1445181253

Should I modify my ppa repository list or take some other action to fix this issue.

Update:
I tried removing R from the server using 

sudo apt-get --purge remove r-base
sudo apt-get --purge remove r-base-core
sudo apt-get --purge remove r-base-recommended

However, I am still seeing the same issue with apt-get update.

Best Answer

Look at the "Secure APT" part of https://cran.r-project.org/bin/linux/ubuntu/README.html:

Adding the key with key ID E084DAB9 fixed the problem for me.

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E084DAB9
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