Re-install oracle-xe on Ubuntu

Quite confuse when you want to re-install oracle-xe on Ubuntu. Struggling for several hours googling, I found this tip:
1. Run “sudo dpkg -P oracle-xe-universal” to get Ubuntu remove all the files as well as configuration files.
2. Delete folder: “/usr/lib/oracle/xe”
3. Restart the machine
4. Install the oracle-xe package.
5. Run “sudo /etc/init.d/oracle-xe configure” to have oracle-xe be setup
6. [...]

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