Libre Office won't start?

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http://askubuntu.com – Every time I click Libre Office in the menu, it returns this error: Failed to execute command "libreoffice --writer %U".Failed to execute child process "libreoffice" (No such file or directory) When installing Libre office, it returns this error: The following packages have unmet dependencies: libreoffice-core : Depends: libreoffice-common (> 1:3.4.5) but it is not going to be installed libreoffice-java-common : Depends: libreoffice-common but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). I trie (HowTos)