mysqldump: unknown option '--:q'

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http://serverfault.com – mysqldump worked fine just yesterday. Today I tried to dump a database and got this error message mysqldump: unknown option '--:q' Nothing helps, I checked all the parameters, runned "mysqldump -h", "mysqldump" without options - always the same result. I suppose the executable is corrupted in some way or .. I really don't know. I think maybe I should try to reinstall the mysqldump but I`m not sure how to do it without breaking the currently working mysql server to stop. Console mysql client is working fine. MySql version is 5.1.54-1. The server is Ubuntu 11.04 (HowTos)