R version in AFNI docker://afni/afni_make_build?

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I just converted the Docker image to Singularity using

$ singularity build --sandbox afni-22.2.04.sbox docker://afni/afni_make_build

I was surprised to find that

$ singularity exec afni-22.2.04.sbox R --version
R version 3.4.4 (2018-03-15) – “Someone to Lean On”

R is currently at version 4.2.1, released 2022-06-23.

That seems quite old. Perhaps it could be updated? There are instructions for supplying a different Ubuntu sources location at

https://cran.r-project.org/bin/linux/ubuntu/fullREADME.html

for example,

deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/

to /etc/apt/sources.list.

Just thought I would suggest that as a possible improvement.

Thanks for considering this suggestion.