Upgrade to 2.14

Hello
I am an Ubuntu 11.04  and R version 2.12 user. I am using Rkward as a GUI
for R . Some of the packages I need were build on 2.14.  Therefore i need to
upgrade to 2.14.   Rkward needs version 2.14 or less. but the version name
cant be with suffix like "natty" (as far as I understand).  Is there a way
to upgrade to 2.14 (and not more) within R or Ubuntu synaptic. 
Thank you
Hanan

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