>I'm using Ubuntu dapper, which only have R of Version 2.2.1.

>Would anybody tell me how to install the latest version of R with 


from the CRAN Ubuntu readme- works for synaptic as well:

* UBUNTU

R packages for Ubuntu on i386 are available. The plans are to support at
least the latest Ubuntu release and the latest LTS release. Currently
(April 2007), these are Feisty Fawn (7.04) and Dapper Drake (6.06),
respectively. Since Feisty was released very shortly before R 2.5.0,
binary packages *for this release of R* are also available for Edgy
Eft (6.10).

To obtain the latest R packages, add an entry like

  deb http://my.favorite.cran.mirror/bin/linux/ubuntu feisty/

or

  deb http://my.favorite.cran.mirror/bin/linux/ubuntu edgy/

or

  deb http://my.favorite.cran.mirror/bin/linux/ubuntu dapper/

in your /etc/apt/sources.list file. See 
http://cran.r-project.org/mirrors.html
for the list of CRAN mirrors. To install the complete R system, use

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

Users who need to compile packages should also install the r-base-dev
package:

  sudo apt-get install r-base-dev

The R packages for Ubuntu should otherwise behave like the Debian ones. For
more information, see the README file in

  http://cran.R-project.org/bin/linux/debian/

* SECURE APT

The Ubuntu archives on CRAN are signed with the key of "Vincent Goulet
<vincent.goulet@act.ulaval.ca>" with key ID E2A11821. You can fetch
this with

  gpg --keyserver subkeys.pgp.net --recv-key E2A11821

and then you feed the key to apt-key with

  gpg -a --export E2A11821 | sudo apt-key add -

Some people have reported difficulties using this approach. The issue
was usually related to a firewall blocking port 11371. An alternative
approach is to search for the key at http://keyserver.noreply.org/ and
copy the key to a plain text file, say key.txt. Then, feed the key to
apt-key with

  sudo apt-key add key.txt


* ACKNOWLEDGEMENT

The Debian R packages are maintained by Dirk Eddelbuettel and Doug Bates.
The Ubuntu packages are compiled for i386 by Vincent Goulet.


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