Builds failing on ubuntu 24.04

[froggleston]

I have added an explicit ubuntu 22.04 runner to highlight and confirm issues relating to ubuntu 24.04.

In this case, some underlying package is breaking sandpaper tests, and my money is on libxml2-dev as this has been bumped from 2.9.13 to 2.9.14.

I'll investigate more, but currently 24.04 builds are failing.

[froggleston]

I can now reproduce this locally, and have traced it to {withr} behaviour, so have raised the issue there: r-lib/withr#277

[froggleston]

If anyone else is experiencing this issue, the locale explicitly needs to be set in ubuntu 24.04 for the withr code to work as intended. withr fails silently when LANG is unset or set to C.UTF-8.

Using the following in the action fixes the problem:

  sudo locale-gen en_US.UTF-8
  sudo update-locale LANG=en_US.UTF-8