O arquivo .desktop para o MySQL Workbench já existe em / usr / share / applications. Aqui está ...
$ more mysql-workbench.desktop [Desktop Entry]
Name=MySQL Workbench
Comment=MySQL Database Design, Administration and Development Tool
Exec=mysql-workbench
Terminal=false
Type=Application
Icon=mysql-workbench
MimeType=application/vnd.mysql-workbench-model;
Categories=GTK;Database;Development;
StartupWMClass=mysql-workbench-bin