# Equations involve different mesh spaces **URL:** \ **Category:** General Discussion\ **Created:** [May 12, 2023, 5:38am UTC](https://community.freefem.org/t/equations-involve-different-mesh-spaces/2453 "2023-05-12T05:38:54Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![marchywka](https://avatars.discourse-cdn.com/v4/letter/m/ee59a6/32.png) [@marchywka](https://community.freefem.org/u/marchywka)\ **Post date:** [May 16, 2023, 11:14am UTC](https://community.freefem.org/t/equations-involve-different-mesh-spaces/2453/21 "2023-05-16T11:14:37Z")
Fortran is still pretty common and recently I even found a COBOL compiler in a ubuntu distro. However, I just moved from ubuntu 16 to 20 and my existin FF is looking for a fortran runtime but a few choices so far did not work,… I’ve never had an issue with fortran before ---
**Author:** ![Starivers](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/starivers/32/1694_2.png) [@Starivers](https://community.freefem.org/u/Starivers)\ **Post date:** [May 16, 2023, 12:06pm UTC](https://community.freefem.org/t/equations-involve-different-mesh-spaces/2453/22 "2023-05-16T12:06:11Z")
I struggle to compile “Develop branch” for two days… I know little about basis of computer and dont want to waste time on it… If you can compile the branch could you run a test code for me ? ---
**Author:** ![marchywka](https://avatars.discourse-cdn.com/v4/letter/m/ee59a6/32.png) [@marchywka](https://community.freefem.org/u/marchywka)\ **Post date:** [May 16, 2023, 12:22pm UTC](https://community.freefem.org/t/equations-involve-different-mesh-spaces/2453/23 "2023-05-16T12:22:52Z")
If you saw my FF install you wouldn’t ask 🙂 I’m on a temp setup now waiting for new hard drive but in the meantime went from 16 to 20. Generally I’m looking for code to run that has a known solution to learn all this stuff so sure I would consider running about anything. Thanks. [Previous page](https://community.freefem.org/t/equations-involve-different-mesh-spaces/2453.md?page=1)