Ubuntu 14.04。包管理器报告 postgresql 已损坏。当我尝试升级时，它产生了以下错误：
(synaptic:30668): GLib-CRITICAL **: g_child_watch_add_full: assertion 'pid > 0' failed
(Reading database ... 377899 files and directories currently installed.)
Preparing to unpack .../postgresql-9.3_9.3.5-0ubuntu0.14.04.1_amd64.deb ...
* Stopping PostgreSQL 9.3 database server * Use of uninitialized value $info{"pgdata"} in -d at /usr/bin/pg_ctlcluster line 354.
Use of uninitialized value $info{"pgdata"} in concatenation (.) or string at /usr/bin/pg_ctlcluster line 355.
Error: is not accessible or does not exist
[fail]
invoke-rc.d: initscript postgresql, action "stop" failed.
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
* Stopping PostgreSQL 9.3 database server * Use of uninitialized value $info{"pgdata"} in -d at /usr/bin/pg_ctlcluster line 354.
Use of uninitialized value $info{"pgdata"} in concatenation (.) or string at /usr/bin/pg_ctlcluster line 355.
Error: is not accessible or does not exist
[fail]
invoke-rc.d: initscript postgresql, action "stop" failed.
dpkg: error processing archive /var/cache/apt/archives/postgresql-9.3_9.3.5- 0ubuntu0.14.04.1_amd64.deb (--unpack):
subprocess new pre-removal script returned error exit status 1
Errors were encountered while processing:
/var/cache/apt/archives/postgresql-9.3_9.3.5-0ubuntu0.14.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:
Setting up postgresql-9.3-postgis-2.1 (2.1.2+dfsg-2) ...
dpkg: dependency problems prevent configuration of postgresql-contrib-9.3:
postgresql-contrib-9.3 depends on postgresql-9.3 (= 9.3.5-0ubuntu0.14.04.1); however:
Version of postgresql-9.3 on system is 9.3.4-1.
dpkg: error processing package postgresql-contrib-9.3 (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
postgresql-contrib-9.3
PGDATA 变量在 /etc/profile.d 中分配并存在于所有 shell 中。