The newest CRAN does not support ubuntu precise anymore.
But some packages need to upgrade the R to > 4.0.
So, you have to re-isntall the r from source code, and set repo as “cloud.r-project.org”, then the install.package will work by install from source code.
options(repos = c(CRAN = "cloud.r-project.org"))
First, you should uninstall the r from the server.
apt-get --purge remove r-base apt-get --purge remove r-base-core apt-get --purge remove r-base-dev apt-get autoremove
Then, download R source code from https://cran.r-project.org
$ tar -zcvr R-3.4.0.tar.gz # cd R-3.4.0 # ./configure
It occurs errors.
apt-get install liblzma-dev ./configure --enable-R-shlib --with-blas --with-lapack make make check cp R-3.4.- /usr/local/src ln -s ../src/R-3.4.0/bin/R .
Third, install rstudio-server
rstudio-server verify-installation rstudio-server start