Hello.
Brand new install of Ubuntu 1804, latest Boinc - 7.16.16 on an FX6300
The following task, and tons more, errored out immediately. This happened in November as well and I never did figure out how to resolve the issue, but I'm trying again now that I have more time to troubleshoot.
https://www.mlcathome.org/mlcathome/result.php?resultid=4103592

It claims the file system is read only and there is an error mounting. Other projects are crunching without issue, so either I am missing something blatantly obvious or receiving the wrong information.

I have attempted to both reset and remove the project, making sure everything was removed from /var/lib/boinc/projects relating to MLC. It is. Then attempting to add it once again with the same result, just in case there were errors downloading the needed files or with the files themselves.
I have no idea what to do or try next. This sort of thing has never happened before with any other project and nothing, that I can see, is read only on my file system. I've tried searching for issues with this particular build of Boinc and am not finding anything related to mine.
Any help is very much appreciated. I've got a few more systems that I'd like to get going on this project again, but don't want to add them until I can make sure I get this resolved. The last thing I want to do is hurt the project with of errored out tasks.
/tmp does not appear to have anything relating to MLC listed.

Brand new install of Ubuntu 1804, latest Boinc - 7.16.16 on an FX6300

You probably got BOINC 7.16.16 from Locutus of Borg. I found out on QuChemPedIA that it does not include all the required libraries for that project.
I uninstalled it, and went back to the standard apt version using "sudo apt install boinc". You get BOINC 7.9.3 on Ubuntu 18.04, which works for me.

Brand new install of Ubuntu 1804, latest Boinc - 7.16.16 on an FX6300

You probably got BOINC 7.16.16 from Locutus of Borg. I found out on QuChemPedIA that it does not include all the required libraries for that project.
I uninstalled it, and went back to the standard apt version using "sudo apt install boinc". You get BOINC 7.9.3 on Ubuntu 18.04, which works for me.

Yes, that's exactly where I got it from. This helps a ton, thank you.
I'll go back to 7.9.3.
Are there any worthwhile improvements in Ubuntu 20.04 that make it worth upgrading, apart from newer Boinc versions in the repository itself, not that that means too much.