postgresql failed

[FSA]

Ubuntu 20.04, matrix-synapse-1.11.0
Service failed with:
```
database:
  name: "psycopg2"
  args:
    user: "matrix"
    password: "mypassword"
    database: "matrix"
    host: "localhost"
    cp_min: 5
    cp_max: 10
```
No error message.
syslog:
```
Mar 7 11:38:27 ubuntu-2gb-nbg1-1 systemd[1]: Starting Synapse Matrix homeserver...
Mar 7 11:38:29 ubuntu-2gb-nbg1-1 systemd[1]: Started Synapse Matrix homeserver.
Mar 7 11:38:30 ubuntu-2gb-nbg1-1 synapse[122934]: root: [None] ***** STARTING SERVER *****
Mar 7 11:38:30 ubuntu-2gb-nbg1-1 synapse[122934]: root: [None] Server /usr/lib/python3/dist-packages/synapse/app/homeserver.py version 1.11.0
Mar 7 11:38:30 ubuntu-2gb-nbg1-1 synapse[122934]: root: [None] Server hostname: tavda.info
Mar 7 11:38:30 ubuntu-2gb-nbg1-1 synapse[122934]: synapse.app.homeserver: [None] Setting up server
Mar 7 11:38:30 ubuntu-2gb-nbg1-1 synapse[122934]: synapse.server: [None] Setting up.
Mar 7 11:38:31 ubuntu-2gb-nbg1-1 systemd[1]: matrix-synapse.service: Main process exited, code=exited, status=1/FAILURE
Mar 7 11:38:31 ubuntu-2gb-nbg1-1 systemd[1]: matrix-synapse.service: Failed with result 'exit-code'.
Mar 7 11:38:34 ubuntu-2gb-nbg1-1 systemd[1]: matrix-synapse.service: Scheduled restart job, restart counter is at 4.
Mar 7 11:38:34 ubuntu-2gb-nbg1-1 systemd[1]: Stopped Synapse Matrix homeserver.
Mar 7 11:38:34 ubuntu-2gb-nbg1-1 systemd[1]: Starting Synapse Matrix homeserver...
Mar 7 11:38:35 ubuntu-2gb-nbg1-1 systemd[1]: Started Synapse Matrix homeserver.
```
This config work fine on Ubuntu 18.04 LTS (matrix.org/package/debian, matrix-synapse-1.11.0 and 1.11.1).
SQLite work without errors.

При добавлении в конфигурацию настроек базы PostgreSQL сервис перестаёт стартовать. В syslog только сообщения об остановке процесса. При запуске с SQLite проблем не наблюдается. База данных точно доступна (захожу через Adminer (PHP) без проблем).

[FSA (fsa)]

python3-psycopg2 required.

# sudo apt install python3-psycopg2