I could see that the wine-based installer exited with a normal exit code of 0, but a subsequent command to clean up the files involved a shell mv command, which spit out a version conflict error with a file in a steam runtime folder located among the Lutris runtimes. I browsed to the folder /home/thub/.local/share/lutris/runtime/steam, renamed it, and relaunched lutris -d so that I could see the log output and I tried the install again. This time it worked perfectly! Now I know I can safely delete that renamed folder.