First: If your install isn't already damaged, you can drop unwanted PostgreSQL servers ("clusters") in Ubuntu using pg_dropcluster. Use that in preference to a full purge and reinstall if you just want to start with a freshly initdb'd PostgreSQL instance.
If you really need to do a full purge and reinstall, first make sure PostgreSQL isn't running. ps -C postgres should show no results.
Now run:
apt-get --purge remove postgresql\*to remove everything PostgreSQL from your system. Just purging the postgres package isn't enough since it's just an empty meta-package.
Once all PostgreSQL packages have been removed, run:
rm -r /etc/postgresql/
rm -r /etc/postgresql-common/
rm -r /var/lib/postgresql/
userdel -r postgres
groupdel postgresYou should now be able to:
apt-get install postgresqlor for a complete install:
apt-get install postgresql-8.4 postgresql-contrib-8.4 postgresql-doc-8.4来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/31537575/viewspace-3126670/ ，如需转载，请注明出处，否则将追究法律责任。
