On 01/05/2020 12:24 p.m., Roger Coppock wrote:
After I changed to Version R version 4.0.0 (2020-04-24) -- "Arbor Day" on my MacBook running Mac OS 10.13.6, I lost all 
my loaded libraries.  Also, the package installer can not contact CRAN libraries either for binaries or sources, to replace the 
missing loaded libraries.  The package installer can contact "BioConductor", however.  I am now specifically looking 
for "HURDAT" and "lmtest", which were on CRAN but not "BioConductor".

I'd guess you're using a mirror that is slow to update. I recommend cloud.r-project.org. It is very well maintained by the RStudio folks.

Duncan Murdoch

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