The procedure for uninstalling MySQL Workbench on Linux depends on the packe you are using.

Uninstalling DEB packages

For Debian packages the command is:

shell> sudo dpkg -r mysql-workbench-oss

This does not remove the configuration files. If you wish to also remove the configuration files use:

shell> sudo dpkg --purge mysql-workbench-oss

Uninstalling RPM packages

To uninstall RPM packages use:

shell> sudo rpm -e mysql-workbench-oss

This does not remove the configuration files.