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Hi,
I've tried to upgrade Plesk licence key on Ubuntu 16.04.7 LTS with Plesk 18.0.33 via graphical interface. That failed without error message.
Via command line (plesk bin license -i XXXXXX-XXXXXX-XXXXXX-XXXXXX-XXXXXX) the following error occurred:
/usr/bin/sw-engine: symbol lookup error...