Like most Ubuntu/R users, you probably have a CRAN mirror in your sources.list. 
Ubuntu comments out all third-party sources during an upgrade to avoid 
debugging nightmares where the third-party software interferes with Ubuntu 
standard package upgrade scripts.  This net result is that R generally is 
uninstalled during the upgrade and you have to repeat the setup of the 
repository in sources.list after the upgrade is complete.
Note that your home directory contents are basically untouched during the 
upgrade, so your working files and personal R libraries should be unaffected by 
the uninstall/install of R.

disclaimer: It works for me. As always, YMMV so backup anything you are 
concerned about losing due to Ubuntu coding errors or your own errors.
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Sent from my phone. Please excuse my brevity.

NoSkill ButStyle <noskillbutst...@web.de> wrote:

>Hallo,
>
>I was about to upgrade Ubuntu 11.10 to 12.04 when I saw that this would
>mean that the package 'r-base-dev' would be removed. What exactly does
>this imply? Will R be still working correctly after the upgrade? Will
>the pacakge automatically be reinstalled (it didnt appear in any other
>lists as the list of packages which were to be installed)?
>
>How should I proceed?
>
>Thanks in advance
>
>______________________________________________
>R-help@r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

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