Dear all, With this email I would like to announce the availability of R 3.4.0 for jessie and stretch on CRAN. Please excuse the delay, caused by some uncertainty about how to deal properly with the incompatibility of R 3.4.0 with packages compiled with earlier versions that use calls to .C and .Fortran in their code as described in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861333 where there is also a summary (but no list at the moment) of affected packages, provided by Dirk. In order to avoid breaking packages without the user being prepared for it, I have created a new repository for R 3.4.0, so you need to replace jessie-cran3 with jessie-cran34 if you are using the CRAN backports on jessie. Before the upgrade, you should deinstall r-cran-* or r-bioc-* packages from the jessie or stretch archives that use .C or .Fortran as they will not work with R 3.4.0. You can replace them by locally compiled versions installed from within R using install.packages() or the like. Packages that have been installed locally (not from .deb packages) should be updated using update.packages(lib.loc="/usr/local/lib/R/site-library", ask=FALSE, checkBuilt=TRUE) I would also like to announce that from R 3.4.0 on, I am signing the Debian repositories on CRAN with my new key. You can import it using apt-key adv --keyserver keys.gnupg.net --recv-key 'E19F5F87128899B192B1A2C2AD5F960A256A04AF' Please see the README on CRAN for details: https://cran.r-project.org/bin/linux/debian/ Kind regards, Johannes