Error gdata and gplots packages

Hi, I just installed Ubuntu 12.04.4. I installed R by following 
instructions from CRAN after modification into my /etc/apt/sources.list file

  sudo apt-get update

  sudo apt-get install r-base

  sudo apt-get install r-base-dev


  When I try to load library(gdata) ou library(gplots), I have error 
message :

library(gdata)

gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED.

gdata: read.xls support for 'XLSX' (Excel 2007+) files ENABLED.

Attachement du package : ?gdata?

L'objet suivant est masqu? from ?package:stats?:

     nobs

L'objet suivant est masqu? from ?package:utils?:

     object.size

library(gplots)

KernSmooth 2.23 loaded

Copyright M. P. Wand 1997-2009

Attachement du package : ?gplots?

L'objet suivant est masqu? from ?package:stats?:

     lowess



sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
  [1] LC_CTYPE=fr_FR.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=fr_FR.UTF-8        LC_COLLATE=fr_FR.UTF-8
  [5] LC_MONETARY=fr_FR.UTF-8    LC_MESSAGES=fr_FR.UTF-8
  [7] LC_PAPER=fr_FR.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=fr_FR.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

other attached packages:
[1] gplots_2.12.1 gdata_2.13.2

loaded via a namespace (and not attached):
[1] bitops_1.0-6       caTools_1.16       gtools_3.3.0 KernSmooth_2.23-10


Thanks,

Elodie

--
Elodie Chapeaublanc
IE Bioinformatique
?quipe Oncologie Mol?culaire
Institut Curie - UMR 144 - CNRS
26 rue d'Ulm - 75248 Paris Cedex 05
Tel: +33 1 56 24 63 57
Email: elodie.chapeaublanc at curie.fr