[R-sig-Debian] Solution to apt-key depreciation

[Carl Delfin]

Hi everyone,

Since apt-key will be deprecated in future releases of Debian (https://manpages.debian.org/testing/apt/apt-key.8.en.html), I recently got around to figuring out how to properly import Michael Rutter's key, based on this answer over at askubuntu: https://askubuntu.com/a/1307181.

Perhaps something along those lines should be added to the README at https://cran.r-project.org/bin/linux/ubuntu/fullREADME.html?

Cheers,
Carl

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