Ubuntu Impish (21.10) repository complains about weak security information

| Thanks Dirk, that gets me one step further. However, there is still a
| hurdle. It seems that (at least at the time of writing) the
| impish-cran40/ repo is broken.

You are correct, sorry. I rushed earlier to help you on the key issue, and
missed that this is indeed commented out here in my list file for apt.

Now, you can get R 4.2.0 from the usual location but selecting 20.04 aka
focal (which will run on 21.10), or, as I tweeted the day R 4.2.0 was
released, from my PPA at launchpad which also has an impish build.

https://launchpad.net/~edd/+archive/ubuntu/misc?field.series_filter=impish

Hth, Dirk

dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org