I'm running Ubuntu 12.04.5 LTS precise 32-bit and trying to install the lmerTest package for R version 2.14.1... When I try to install from the CRAN repository or R-forge: install.packages("lmerTest") or install.packages("lmerTest", repos="http://R-Forge.R-project.org"), I get the error: Warning in install.packages : package ‘lmerTest’ is not available (for R version 2.14.1) So I downloaded the Package Archive File from CRAN and tried to install from this Package source: lmerTest_2.0-11.tar.gz ,but get the error: "installation of package /home/.../lmerTest_2.0-11.tar.gz’ had non-zero exit status" I had a similar problem when trying to install lme4, and using the advice from lme4 package install failing on Ubuntu 12.04 was able to download the package using "sudo apt-get install r-cran-lme4" after which it appeared in my R package list and installed fine from there. I tried a similar tactic with lmerTest "sudo apt-get install r-cran-lmerTest" but just get "Unable to locate package r-cran-lmerTest", so really don't know what to do now, bearing in mind that I'm a novice with both Ubuntu and R, any suggestions/help would be much appreciated