chooseBioCmirror(graphics = getOption("menu.graphics"), ind = NULL)menu.options("BioC_mirror").
"BioC_mirror": it needs to be used before
a call to setRepositories.In addition to the Bioconductor master site (in Seattle, USA), there currently are mirrors in Bethesda (USA), Dortmund (Germany), Bergen (Norway) and Cambridge (UK).
setRepositories, chooseCRANmirror.