> biocLite("BiocParallel") BioC_mirror: https://bioconductor.org Using Bioconductor 3.8 (BiocInstaller 1.31.1), R 3.5.0 (2018-04-23). Installing package(s) ‘BiocParallel’ Warning message: package ‘BiocParallel’ is not available (for R version 3.5.0) > sessionInfo() R version 3.5.0 (2018-04-23) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 16.04.4 LTS Matrix products: default BLAS: /usr/lib/libblas/libblas.so.3.6.0 LAPACK: /usr/lib/lapack/liblapack.so.3.6.0 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:  stats graphics grDevices utils datasets methods base other attached packages:  BiocInstaller_1.31.1 loaded via a namespace (and not attached):  compiler_3.5.0 tools_3.5.0
The 'devel' software repository was 'flushed' (all packages removed then repopulated) so that packages would include a Date/Published: field inserted by the nightly builder. Unfortunately, package that fail to build do not get pushed to the flushed repository, and BiocParallel had a timeout on the nightly builds. Until the timeout clears, your best bet is to install this from source
git clone https://git.bioconductor.org/packages/BiocParallel R CMD INSTALL BIocParallel
This problem is transient, and only a small number of packages are affected.