I just upgraded to R 4.2.0 and am attempting to load the package RBGL because it appears to be a dependency for the function plot(). When I attempt to run the following code posted on the Bioconductor site directing this to be run within R 4.2.0, I get the following error.

 if (!require("BiocManager", quietly = TRUE))
+     install.packages("BiocManager")
> 
> BiocManager::install("RBGL")
'getOption("repos")' replaces Bioconductor standard repositories, see '?repositories' for
details

replacement repositories:
    CRAN: http://cran.rstudio.com/

Warning: unable to access index for repository https://bioconductor.org/packages/3.15/bioc/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/bioc/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/annotation/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/annotation/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/experiment/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/experiment/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/workflows/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/workflows/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/books/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/books/src/contrib/PACKAGES'
Bioconductor version 3.15 (BiocManager 1.30.18), R 4.2.0 (2022-04-22 ucrt)
Installing package(s) 'RBGL'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/bioc/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/bioc/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/annotation/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/annotation/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/experiment/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/experiment/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/workflows/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/workflows/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/books/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/books/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/bioc/bin/windows/contrib/4.2:
  cannot open URL 'https://bioconductor.org/packages/3.15/bioc/bin/windows/contrib/4.2/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/annotation/bin/windows/contrib/4.2:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/annotation/bin/windows/contrib/4.2/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/experiment/bin/windows/contrib/4.2:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/experiment/bin/windows/contrib/4.2/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/workflows/bin/windows/contrib/4.2:
  cannot open URL 'https://bioconductor.org/packages/3.15/workflows/bin/windows/contrib/4.2/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/books/bin/windows/contrib/4.2:
  cannot open URL 'https://bioconductor.org/packages/3.15/books/bin/windows/contrib/4.2/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/bioc/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/bioc/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/annotation/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/annotation/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/data/experiment/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/data/experiment/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/workflows/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/workflows/src/contrib/PACKAGES'
Warning: unable to access index for repository https://bioconductor.org/packages/3.15/books/src/contrib:
  cannot open URL 'https://bioconductor.org/packages/3.15/books/src/contrib/PACKAGES'
Warning message:
package ‘RBGL’ is not available for Bioconductor version '3.15'

That might have been transitory. If you try again, does it work, or is it consistent?