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...ific ppa. For backports you're | going to have to do it by hand. Maybe there's a nice dpkg way to list | all packages you installed from backports? +1 And that is what I was referring to with 'show us your error messages'. If something 'blocks', do a 'apt-cache policy nameofthatpackage' to see where it came from. Worst case, uninstall components (carefully) as suggested here. By removing R and pieces you should not be able to brick your system. PPAs are great, but they are /not/ tested against each other as the distro core is. Dirk -- http://dirk.eddelbuettel.com | @edde...

I can make a few suggestions to help you hunt for the issue. This kind of error is often caused by conflicting packages from proposed, backports, ppas, or other 3rd party repos. If for some reason you have a dependency installed from one of those sources that is newer than what R on cran was built against (stock ubuntu 14.04) then you will hit a conflict. Simply removing backports from your repos