Error: With R version 3.5 or greater, install Bioconductor packages using BiocManager; see https://bioconductor.org/install
It's not clear why you have posted this. Are you having trouble installing some package and looking for help?
Please modify your post to include an actual question and provide details like the command you have tried that fail, along with the error you get and the output of sessionInfo()
This ERROR is seen when you try source("https://bioconductor.org/biocLite.R") on an R version > 3.5 . The ERROR is correct. As of R version 3.5, the proper way to install Bioconductor packages is by using BiocManager as described on the referenced page https://bioconductor.org/install. As Steve Lianoglou mentioned, if you are having trouble installing a particular package please include more information and your sessionInfo()