I know the latest version of Bioconductor (3.12) is meant to work with R-4.0.3, but I have to use R-4.0.2 for reasons I won't get into here.
I am having trouble installing DelayedArray:
installing to /home/username/R/x86_64-pc-linux-gnu-library/4.0/00LOCK-DelayedArray/00new/DelayedArray/libs ** R ** inst ** byte-compile and prepare package for lazy loading Creating a new generic function for ‘rowsum’ in package ‘DelayedArray’ Creating a new generic function for ‘aperm’ in package ‘DelayedArray’ Error in reconcilePropertiesAndPrototype(name, slots, prototype, superClasses, : no definition was found for superclass “DataTable” in the specification of class “DelayedMatrix” Error: unable to load R code in package ‘DelayedArray’ Execution halted ERROR: lazy loading failed for package ‘DelayedArray’ * removing ‘/home/username/R/x86_64-pc-linux-gnu-library/4.0/DelayedArray’ > sessionInfo() R version 4.0.2 (2020-06-22) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 18.04.4 LTS Matrix products: default BLAS/LAPACK: /app/software/OpenBLAS/0.3.7-GCC-8.3.0/lib/libopenblas_haswellp-r0.3.7.so locale:  LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C  LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8  LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8  LC_PAPER=en_US.UTF-8 LC_NAME=C  LC_ADDRESS=C LC_TELEPHONE=C  LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages:  parallel stats4 stats graphics grDevices utils datasets  methods base other attached packages:  DelayedDataFrame_1.4.0 DelayedArray_0.14.0 IRanges_2.22.2  matrixStats_0.58.0 S4Vectors_0.26.1 BiocGenerics_0.34.0  BiocManager_1.30.10 loaded via a namespace (and not attached):  compiler_4.0.2 Matrix_1.2-18 tools_4.0.2 grid_4.0.2  lattice_0.20-41
Also, I was a bit confused by the message I saw when loading BiocManager:
> library(BiocManager) Bioconductor version 3.11 (BiocManager 1.30.10), ?BiocManager::install for help Bioconductor version '3.11' is out-of-date; the current release version '3.12' is available with R version '4.0'; see https://bioconductor.org/install
The page referenced there says that Bioc 3.12 is meant for use with R-4.0.3, so I assume that 3.11 is still the correct version for R-4.0.2?