Not 100% certain that you have the same problem, but I found out the hard way that my job blocks each mirror site option that was offered and I was getting errors like this:
Installing package into ‘/usr/lib64/R/library’ (as ‘lib’ is unspecified) --- Please select a CRAN mirror for use in this session --- Error in download.file(url, destfile = f, quiet = TRUE) : unsupported URL scheme Warning: unable to access index for repository https://rweb.crmda.ku.edu/cran/src/contrib Warning message: package ‘ggplot2’ is not available (for R version 3.2.2)
Workaround (I am using CentOS)...
install.packages('package_name', dependencies=TRUE, repos='http://cran.rstudio.com/')
I hope this saves someone hours of frustration.
~ Answered on 2015-10-22 14:32:39