Oracle Database Express Edition (XE)

Hi,
Some time ago I had problems with XE database: 2429182

Now I have another but little similar problem.
I installed OracleXE from DEB package: oracle-xe_11.2.0-2_amd64.deb (several times: install and then uninstall with aptitude ).

At the end of installation there is a message: So I'm doing:

# /etc/init.d/oracle-xe configure
Oracle Database 11g Express Edition is already configured

The message was not displayed during my previous installations.
But tnsnames.ora and listener.ora files looks like:

# tnsnames.ora Network Configuration File:

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = %hostname%)(PORT = %port%))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

# listener.ora Network Configuration File:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/xe)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = %hostname%)(PORT = %port%))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

What must I do to fix this?

(To be continued...)