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After updating 11.04 to 11.10 using 'do-release-upgrade', installer did not updated PostgreSQL 8.4 to 9 version, saying that i have to do it manually. But how? I heard many problems, for example data loss, or dissapered config files after updating manually from 8.4 to 9 in Ubuntu. Sow how to update, to avoid data damage or other problems? Thanks.

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Start by making a backup of your database, worse case scenerio I would hope you could re-install 11.04 and restore postgresql from backup. You may need to re-install postgresql 8.4 first.

Stop postgresql and any services that use it (apache ?)

su - postgres
pg_dumpall >backup_db
exit

Save a copy of backup_db to 2 safe locations, /root and a flash drive.

Now purge 8.4 and install 9.0

apt-get purge postgresql-8.4
apt-get install postgresql-9.0

Now restore your data

su - postgres
psql <backup_db
exit

Restart postgresql and your other services, check your data.

Good luck =)

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