How to get FFI working on Ruby 2.7.2 image?

[mike]

I noticed this article that spoke about a change from Ubuntu 18.04 to 20.04.

Question #690445 “libffi.so.6: cannot open shared object file” : Questions :...

The newer convenience images did switch to using 20.04 for later releases not that long ago

Ubuntu 20.04 & Next-Gen Convenience Images

Beginning this month we have begun Ubuntu 20.04 availability in next-gen Convenience Images. The CircleCI Base Image (cimg/base) now has both Ubuntu 18.04 and Ubuntu 20.04 versions. How this may or may not affect you depends on if you’re using the base image directly or if you are using a language image. Language images are the Go, Node.js, Ruby, etc next-gen Convenience Images. Information for the base image is the next section. To skip to information for languages images, click here. The Circ…

I’m curious if maybe your previous image was using Ubuntu 18.04 and now this image is 20.04

You can try the simlink command in that Launchpad thread

sudo ln -s /usr/lib/x86_64-linux-gnu/libffi.so.7 /usr/lib/x86_64-linux-gnu/libffi.so.6

Before you try that, I would make sure to increment and your CircleCI caches as this might just be a mixed cache issue. Starting with a fresh cache will make sure all the gems are rebuilt.