How to rollback to R 2.12.1 version on Ubuntu? [closed]

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I was using R 2.12.1 on my desktop and recently the R got updated to the new version R 2.13.0 which is not I want. Is there anyway to use the R 2.12.1 again and how can I use that?

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packages.ubuntu.com seems to have R 2.11.2 for maverick, so that is no help. You may try to see if the Michael's PPA site on launchpad has a rollback feature so that you can get that version there. (Edit: Doesn't seem so. Hmpf.)

Barring that, I would grab the Debian source for 2.12.2 (using the snapshot.debian.org site which has all previous Debian version of r-base and build replacement .deb binaries from that.

Or ... can't you upgrade BioC to a version that works with R 2.13.0? Didn't BioC just have a release too?

Lastly, by far the easiest is to

• uncomment the entry for CRAN in /etc/apt/sources.list
• update, and
• install the most recent Ubuntu version, which is 2.11.2 as shown above.

Ubuntu's next release will get presumably 2.12.* too, so you could also try upgrading to Ubuntu 11.4 now (but note that it is not yet released).

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If it was a recent update, it's likely still on your system:

/var/cache/apt/archives