My Ubuntu version is 14.04(Trusty).

From here.

Install R

1. Get the CRAN mirrors list from here.

2. Add the following lines to the end of “/etc/apt/sources.list” file:

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## Add R.
## CRAN mirrors list: http://cran.r-project.org/mirrors.html
deb http://mirror.bjtu.edu.cn/cran/bin/linux/ubuntu trusty/

3. Run commands below to install R.

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

Done.

Install the “RWeka” package

From here.

1. Add the following line in your “.bashrc” file:

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# THe content of this line depends on your Java installation path.
export LD_LIBRARY_PATH=/usr/lib/jvm/java-8-oracle/jre/lib/amd64:/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server

2. Start R

   You can start with “sudo” to install the package in the system level library directory, otherwise it will be install on your home directory.

   Run the command below:

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install.packages("RWeka")