How can I change the hostname after Oracle Database XE is installed?

I currently have XE installed and working on my ubuntu machine.
When I change the hostname of my machine, oracle database no longer connects and says "ORA-12505, TNS:listener does not currently know of SID given in connect descriptor".
Can anyone tell me how I can change the hostname of my machine and keep oracle database working correctly?
Thanks

Stopping, reconfig, starting the instance is one way, although that is somewhat like using petrol to kill ants.
The database instance pretty much does not care about the hostname setting. But the listener does- the installer finds the hostname and uses that in the setup bits.
As posted somewhere here, when using the 1521 default listener port, the listener.ora config file can just be moved out of the way. Another potential fix is setting the HOST=0.0.0.0 for the IPv4 "any IP" address setting, or setting it to the correct hostname. Or HOST= can be set to IPv4 address. For IPv6, have to use HOST=<hostname> and it must resolve, can't HOST=... an IPv6 address.
To move the listener file, stop the listener first. To change a HOST=... setting, also stop the listener first.
lsnrctl stop
mv $ORACLE_HOME/network/admin/listener.ora $ORACLE_HOME/network/admin/listener.bk0
# or
vi $ORACLE_HOME/network/admin/listener.ora
# change HOST=<whatever> to the correct value, or 0.0.0.0
lsnrctl start
sqlplus /nolog
conn system
... password ... Connected.
alter system register;
exit
# start the lsnr
lsnrctl start
# check the status, services
lsnrctl stat
lsnrctl serv
If the host has a wireless (or another NIC) that one does not want to offer up remote connections on, the 0.0.0.0 is not a good way to go either
Message was edited by: clcarter
typos

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stlbbl4u wrote:
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