sudo apt install r-cran-devtools libcurl4-openssl-dev libssl-dev libxml2-dev R --no-save -e 'install.packages(c("languageserver", "roxygen2"))'
$ R --no-save --slave -e '.packages(T)[grep("languageserver|roxygen2",.packages(T))]' [1] "languageserver" "roxygen2"