Postgresql-Server won't start after moving data directory I am running a local postgresql server (9.5 &amp; 9.6) on my Ubuntu 17.04 machine. After moving my data directories to another hard drive following this guide the server can't start.
I.e. with
sudo service postgresql restart &amp;&amp; sudo service postgresql status 

● postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
   Active: active (exited) since Mon 2017-11-06 10:31:32 CET; 1min 42s ago
  Process: 8962 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
 Main PID: 8962 (code=exited, status=0/SUCCESS)

Nov 06 10:31:32 HERCULES systemd[1]: Starting PostgreSQL RDBMS...
Nov 06 10:31:32 HERCULES systemd[1]: Started PostgreSQL RDBMS.

The logs for both versions then contain the following:
pg_ctl: could not access directory &quot;/media/daveknave/BIGFS/PGSQL/9.5/main&quot;: Keine Berechtigung

&quot;Keine Berechtigung&quot; translates to &quot;Permission denied&quot;.
ls -l /media/daveknave/BIGFS/PGSQL/9.5/main

gives
drwxrwxrwx 5 postgres postgres 4096 Sep 25 21:42 base
drwxrwxrwx 2 postgres postgres 4096 Nov  3 21:07 global
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_clog
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_commit_ts
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_dynshmem
drwxrwxrwx 4 postgres postgres 4096 Sep 25 21:42 pg_logical
drwxrwxrwx 4 postgres postgres 4096 Sep 25 21:42 pg_multixact
drwxrwxrwx 2 postgres postgres 4096 Nov  3 21:07 pg_notify
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_replslot
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_serial
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_snapshots
drwxrwxrwx 2 postgres postgres 4096 Nov  3 21:07 pg_stat
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_stat_tmp
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_subtrans
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_tblspc
drwxrwxrwx 2 postgres postgres 4096 Sep 25 21:42 pg_twophase
-rwxrwxrwx 1 postgres postgres    4 Sep 25 21:42 PG_VERSION
drwxrwxrwx 3 postgres postgres 4096 Nov  2 10:19 pg_xlog
-rwxrwxrwx 1 postgres postgres   88 Sep 25 21:42 postgresql.auto.conf
-rwxrwxrwx 1 postgres postgres  133 Nov  3 21:07 postmaster.opts
-rwxrwxrwx 1 postgres postgres  100 Nov  3 21:07 postmaster.pid

I've set the file permissions in an attempt to solve this, however no result.
Trying to access the server using
sudo -u postgres psql -W

prompts
Password: 
psql: could not connect to server: Datei oder Verzeichnis nicht gefunden
        Is the server running locally and accepting
        connections on Unix domain socket &quot;/var/run/postgresql/.s.PGSQL.5432&quot;?

Can anybody please help? Have any of you encountered that same issue? I've searched using google, but couldn't find any hints to solve my problem.
Verify the permissions on /main with 

ls -l /media/daveknave/BIGFS/PGSQL/9.5/


Does postgres still have access to main? 

Switch user to postgres with su - postgres and then navigate through the directory structure /media/daveknave/BIGFS/PGSQL/9.5/main/. Can you navigate past main into base?

Verify the file permissions beneath ..../base with the following comamnds:

ls -lR /media/daveknave/BIGFS/PGSQL/9.5/main/base &gt; ~/postrgres_main_perm.log


and then 

vi ~/postrgres_main_perm.log


If you find that the permissions are not correct in the log file, then run the following command to grant postgres all permissions to the directory ...main/base and all underlying sub-directories:

chown -Rv postgres:postgres /media/daveknave/BIGFS/PGSQL/9.5/main/base/



  Caution:
  Before you modify all permissions ensure the command works by replacing chown -Rv with something less destructive like ls -R or navigate down to the .../main directory and issue the shorter command: chown -Rv postgres:postgres base/. This will ensure you are applying the command to the correct directory.


Try restarting your PostgreSQL instance again.