Desktop Survival Guide
by Graham Williams
From the Edit menu select the Software Sources option. You may be asked to enter your password (we are assuming you are doing this from a user who has administrator access). The window shown in Figure A.2 will be shown.
Select the Other Software tab to display the list of other software sources included in the software centre, as shown in Figure A.3.
The Add... button at the bottom left should then be clicked. You will be prompted for an APT line, as in Figure A.4.
You could use the following:
deb http://cran.r-project.org/bin/linux/ubuntu lucid/
Click the Add Source button of this popup window to have the software source added to the repository. You will see it appear in the list of sources in the Other Software tab.
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