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Sometimes pressure-vessel fails with "libdl.so.2: cannot open shared object file: No such file or directory"

Sometimes pressure-vessel fails to start a game with the following error:

/usr/lib/pressure-vessel/from-host/bin/pressure-vessel-adverb: error while loading shared libraries: libdl.so.2: cannot open shared object file: No such file or directory

I experience this error a few times and always when I was using the Flatpak version of Steam with the new sub-sandbox feature. The problem is that I'm not able to reliably reproduce it.

Steps to reproduce

  • Use the git version of Flatpak
  • Launch the beta version of com.valvesoftware.Steam
  • Launch a Proton game

slr-app302380-sc4db1d319fc6c1a7.log

Additional info

So far when this bug appeared, a second attempt at running the game always succeeded.

I haven't investigated too much into this problem yet, but apparently at least one other user seems to have experienced the same problem https://github.com/flatpak/flatpak/issues/3797#issuecomment-831420667 (just a guess until we have a log from him)