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Problème d'installation de packages sous R

Bonjour,
J'ai des problèmes quand j'essaye d'installer les packages GEOquery et Rgraphviz sous R. Voila le message d'erreur qu'il me renvoie:

biocLite("Rgraphviz")
Running biocinstall version 2.2.9 with R version 2.7.0
Your version of R requires version 2.2 of BioConductor.
Warning in install.packages(pkgs = pkgs, repos = repos, dependencies = dependencies,  :
  argument 'lib' is missing: using '/home/alice/R/i486-pc-linux-gnu-library/2.7'
trying URL 'http://bioconductor.org/packages/2.2/bioc/src/contrib/Rgraphviz_1.18.1.tar.gz'
Content type 'application/x-gzip' length 510925 bytes (498 Kb)
opened URL
==================================================
downloaded 498 Kb

* Installing *source* package 'Rgraphviz' ...
configure: No --with-graphviz option was specified. Trying to find graphviz using other methods.
checking for pkg-config... /usr/bin/pkg-config
Package libgvc was not found in the pkg-config search path.
Perhaps you should add the directory containing `libgvc.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libgvc' found
configure: pkg-config was not able to find the graphviz library libgvc. This either indicates that graphviz is old or that something is wrong. Verify graphviz is installed and that PKG_CONFIG_PATH is correct.
configure: Using dotneato-config to find graphviz
checking for dotneato-config... no
configure: dotneato-config not found in PATH.
configure: Trying default graphviz dir /usr/local.  Consider specifying --with-graphviz
configure: Using graphviz root directory /usr/local
configure: error: /usr/local/bin/dot not found.  Check graphviz installation.
ERROR: configuration failed for package 'Rgraphviz'
** Removing '/home/alice/R/i486-pc-linux-gnu-library/2.7/Rgraphviz'
** Restoring previous '/home/alice/R/i486-pc-linux-gnu-library/2.7/Rgraphviz'

The downloaded packages are in
        /tmp/RtmpYKlzui/downloaded_packages
Warning message:
In install.packages(pkgs = pkgs, repos = repos, dependencies = dependencies,  :
  installation of package 'Rgraphviz' had non-zero exit status

Je suis plutôt débutante sous Ubuntu et ne sais pas du tout quoi faire. Est-ce que quelqu'un peut m'aider?
Merci!