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The OS is Ubuntu 20.04. I moved the data directory to a secondary disk. In the "Disks" utility, I clicked "Edit Mount Options", turned off "User Session Defaults", and specified a hard-coded Mount Point like /mnt/database, because by default it was mounted at something like /media/[user name]/disk label. "Mount at system startup" had been checked (unchanged from default).

Now, postgresql's automatic start at the system startup fails with a message like: "[data directory] is not accessible or does not exist". If I manually start it, by executing sudo systemctl start postgresql it starts fine. I suspect that the system tried to start postgresql before the secondary disk was automatically mounted. Is that so? If that is the case, how can I make it start after the secondary disk has been mounted?

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I solved it. It was the order.

Open the service file:

sudo nano /lib/systemd/system/[email protected]

Add the disk's name at:

After=network.target mnt-[disk name].mount

If the disk name is "database", then it is mnt-database.mount. - https://dba.stackexchange.com/users/217951

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