- Plesk for Linux
- Plesk Web Admin edition license is installed on the server.
A subscription backup fails with the following error:
PLESK_ERROR: Unable to define superuser password for postgresql server on localhost
The affected subscription has a PostgreSQL database at Domains > example.com > Databases.
Plesk Web Admin edition does not allow to managing PostgreSQL databases in Plesk.
This is a Plesk bug PPPM-9991, which will be fixed in future product updates.
Use one of the workarounds: