Hi everyone.
I tried the following command on ubuntu 14.04 :sudo apt-get install r-base-core
And I get :The following packages have unmet dependencies: r-base-core : Depends: libtiff4 but it is not installable               Recommends: r-recommended but it is not going to be installed               Recommends: r-base-dev but it is not going to be installed               Recommends: r-doc-html but it is not going to be installedE: Unable to correct problems, you have held broken packages.
Tried it with aptitude :
The following packages have unmet dependencies: r-base-core : Depends: libtiff4 which is a virtual package.The following actions will resolve these dependencies:
      Keep the following packages at their current version:1)      r-base-core [Not Installed]                        2)      r-base-dev [Not Installed]                         3)      r-cran-boot [Not Installed]                        4)      r-cran-class [Not Installed]                       5)      r-cran-cluster [Not Installed]                     6)      r-cran-codetools [Not Installed]                   7)      r-cran-foreign [Not Installed]                     8)      r-cran-kernsmooth [Not Installed]                  9)      r-cran-lattice [Not Installed]                     10)     r-cran-mass [Not Installed]                        11)     r-cran-matrix [Not Installed]                      12)     r-cran-mgcv [Not Installed]                        13)     r-cran-nlme [Not Installed]                        14)     r-cran-nnet [Not Installed]                        15)     r-cran-rpart [Not Installed]                       16)     r-cran-spatial [Not Installed]                     17)     r-cran-survival [Not Installed]                    18)     r-recommended [Not Installed]                      


Accept this solution? [Y/n/q/?] yNo packages will be installed, upgraded, or removed.0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.Need to get 0 B of archives. After unpacking 0 B will be used.
I then ran apt-get upgrade, update and other stuff described in this tutorial.Here is the result of the command cat /etc/apt/sources.list :
# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)]/ quantal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to# newer versions of the distribution.deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty main restricteddeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty main restricted
## Major bug fix updates produced after the final release of the## distribution.deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates main restricteddeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team. Also, please note that software in universe WILL NOT receive any## review or updates from the Ubuntu security team.deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty universedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty universedeb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates universedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team, and may not be under a free licence. Please satisfy yourself as to## your rights to use the software. Also, please note that software in## multiverse WILL NOT receive any review or updates from the Ubuntu## security team.deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty multiversedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty multiversedeb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates multiversedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-updates multiverse
## N.B. software from this repository may not have been tested as## extensively as that contained in the main release, although it includes## newer versions of some applications which may provide useful features.## Also, please note that software in backports WILL NOT receive any review## or updates from the Ubuntu security team.deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-backports main restricted universe multiversedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-backports main restricted universe multiverse
deb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security main restricteddeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security main restricteddeb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security universedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security universedeb http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security multiversedeb-src http://mirrors.ircam.fr/pub/ubuntu/archive/ trusty-security multiverse
## Uncomment the following two lines to add software from Canonical's## 'partner' repository.## This software is not part of Ubuntu, but is offered by Canonical and the## respective vendors as a service to Ubuntu users.# deb http://archive.canonical.com/ubuntu quantal partner# deb-src http://archive.canonical.com/ubuntu quantal partner
## This software is not part of Ubuntu, but is offered by third-party## developers who want to ship their latest software.deb http://extras.ubuntu.com/ubuntu trusty maindeb-src http://extras.ubuntu.com/ubuntu trusty maindeb http://cran.rstudio.com/bin/linux/ubuntu precise/



And the result of the command:cat /etc/apt/sources.list.d/* :
# deb http://linux.dropbox.com/ubuntu precise main # disabled on upgrade to saucy# deb http://linux.dropbox.com/ubuntu precise main # disabled on upgrade to saucy# deb http://linux.dropbox.com/ubuntu precise main # disabled on upgrade to saucy# deb http://ppa.launchpad.net/grumbel/ppa/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/grumbel/ppa/ubuntu raring main# deb http://ppa.launchpad.net/grumbel/ppa/ubuntu saucy main # disabled on upgrade to saucy# deb-src http://ppa.launchpad.net/grumbel/ppa/ubuntu raring main# deb http://ppa.launchpad.net/grumbel/ppa/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/grumbel/ppa/ubuntu raring main# This file makes sure that Opera Browser is kept up-to-date# as part of regular system upgrades
deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
# The line above will make sure you get all final public releases.# Uncomment the following line if you want to get alpha and beta# releases, too.
# deb http://deb.opera.com/opera-beta/ stable non-free #Opera Browser (beta releases)# This file makes sure that Opera Browser is kept up-to-date# as part of regular system upgrades
deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
# The line above will make sure you get all final public releases.# Uncomment the following line if you want to get alpha and beta# releases, too.
# deb http://deb.opera.com/opera-beta/ stable non-free #Opera Browser (beta releases)# This file makes sure that Opera Browser is kept up-to-date# as part of regular system upgrades
deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
# The line above will make sure you get all final public releases.# Uncomment the following line if you want to get alpha and beta# releases, too.
# deb http://deb.opera.com/opera-beta/ stable non-free #Opera Browser (beta releases)# deb http://deb.playonlinux.com/ natty main # disabled on upgrade to saucy# deb http://deb.playonlinux.com/ natty main # disabled on upgrade to saucy# deb http://deb.playonlinux.com/ natty main # disabled on upgrade to saucy# deb http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb-src http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb-src http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb-src http://repo.steampowered.com/steam/ precise steam # disabled on upgrade to raring# deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu raring main# deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu saucy main # disabled on upgrade to saucy# deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu raring main# deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu raring main# deb http://ppa.launchpad.net/vincent-c/nevernote/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/vincent-c/nevernote/ubuntu raring main# deb http://ppa.launchpad.net/vincent-c/nevernote/ubuntu saucy main # disabled on upgrade to saucy# deb-src http://ppa.launchpad.net/vincent-c/nevernote/ubuntu raring main# deb http://ppa.launchpad.net/vincent-c/nevernote/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/vincent-c/nevernote/ubuntu raring main# deb http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu raring main# deb http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu saucy main # disabled on upgrade to saucy# deb-src http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu raring main# deb http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu saucy main # disabled on upgrade to saucydeb-src http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu raring main
Also posted this question on askUbuntu.


Cordialy,Guillaume Bersac2bis avenue Guillemin92600 Asnière sur seine06.65.30.89.43
 		 	   		  
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