SMAPI doesn't launch

I am running SDV under Steam on Ubuntu Linux,
SDV 1.6.15 build 24356, Steam Version: 1769025840
I reinstalled SMAPI, and it couldn't find my game folder, which is under ~/snap now.
I told it "/home/peter/snap/steam/common/.steam/steam/steamapps/common/Stardew Valley".
Now, when I start SDV, SMAPI doesn't launch.
There used to need slme launch options that Steam needed, but I can't find the string on the wiki.
Are the launch noptions the problem, or is there something else?

Steps to reproduce (How to cause the error so that the developer can reproduce it)
Expected vs Actual results (What did you expect to happen and what actually
 
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