thisisnic opened a new pull request #11815:
URL: https://github.com/apache/arrow/pull/11815


   I'm not 100% sure why this fixes this fail, but it seems to fix it, and 
here's my reasoning.
   
   So, apt-key, which is used as part of the R bit of the docs build is now 
deprecated[1] and Ubuntu 20.10 (Groovy Gorilla) is no longer a supported 
release as of 22nd July 2021 [2] which can apparently cause issues subsequently 
trying to do stuff via apt[3].
   
   Reading the R docs for Ubuntu packages[4], it says there that "Package for 
the current R 4.1. release* are available for most stable Desktop releases of 
Ubuntu until their official end of life date" which maybe explains why the URL 
for R packages works fine for focal[5] but results in a 404 error for groovy 
[6].
   
   The way of getting the signing key for updating packages changed [4] to no 
longer use apt-key [7] - I have no idea if this had any effect either, but to 
be on the safe side I have updated that too.
   
   [1] https://manpages.debian.org/testing/apt/apt-key.8.en.html
   [2] https://wiki.ubuntu.com/Releases
   [3] https://news.itsfoss.com/ubuntu-20-10-end-of-life/
   [4] https://cran.r-project.org/bin/linux/ubuntu/
   [5] https://cran.r-project.org/bin/linux/ubuntu/focal-cran40/
   [6] https://cran.r-project.org/bin/linux/ubuntu/groovy-cran40/
   [7] 
http://web.archive.org/web/20210618164400/https://cloud.r-project.org/bin/linux/ubuntu/


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