@liya-ai: Hi this doesn't actually solve the problem. For example I build an embedded system using Linux and specifically need Ubuntu 18.04 as the userspace and packages provided with that system are what we've built our build system on. For a variety of reasons I won't get into upgrading to 20.04 or downgrading to 16.04 would be a pretty big undertaking for us. Considering you've added support for 20.04 do you think it's a big lift to add support for 18.04 as well?

I was considering CircleCI for build automation but am not able to use it because it doesn't support our build host.

Chris Parker: Hi Chris! Let me check with the team and see if 18.04 will be supported. Will respond here when I hear back

Chris Parker: Hi Chris. The majority of the people who were requesting Ubuntu 18.04 as a machine image were satisfied once we released our 20.04 image as it's now 2020.

I can definitely understand that there's circumstances where 20.04 is too new and 16.04 is too old. We haven't released an 18.04 image thus far due to a lack of demand. We'd need to see enough of a demand in order to do so.

I did want to ask about your needs here. What specific features from the Linux machine executor do you need? The Docker executor, which is our most popular one, does have an Ubuntu 18.04 image provided by CircleCI as well as any image you'd want to run.

Ricardo Feliciano: I've actually been able to get up and running on one of your competitors who supports Ubuntu 18.04, but I might give your Docker images a shot if they turn out not to work for our organization in the long run.

Do you have any information about specific limitations of your Docker environment? I need to be able to attach files to loopback and mount them, create pseudoterminals, and a few other device-specific things that I wasn't sure would be supported.

From an engineering perspective I had a lot of trouble porting from Ubuntu 16.04 to 18.04 a couple years ago due to certain legacy compilers that are used in our build process. My build system outputs root filesystems and associated artifacts for several embedded systems including one which is now 10 years old. I did try to update to 20.04 about a year ago but ran into too many issues getting that legacy system up and running.