Hi Makis,
Thanks for your advice. My Ubuntu is running in vmware16.
As per your suggestion, I reinstalled the latest preCICE v2.4.0，and read Communication configuration | preCICE - The Coupling Library . Finally, I found a similar question to mine in preCICE hangs during initialization. I deleted the precice-run folder in the exchange directory of the solvers. It works!
Thanks for the inputs.
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