Extension catalog is missing from Plesk after installation

Symptoms

• Plesk installer provided errors like below during installation process:

[2023-05-01 12:34:56.789] 51862:645b74d3d9d97 ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'psaadm' 'mkdir' '-m755' '/opt/psa/var/modules/rest-api' '-p'] with exit code [1] 
[2023-05-10 12:34:56.789] 51862:645b74d3d9d97 ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'psaadm' 'mkdir' '-m755' '/opt/psa/var/modules/catalog' '-p'] with exit code [1]
...
filemng: Error occurred during /bin/mkdir command. 
filemng failed: cp: cannot create directory '/opt/psa/var/modules/performance-booster/': Permission denied 
filemng: Error occurred during /bin/cp command.). Plesk will automatically attempt to install it at a later time

• /opt/psa/var/modules/ directory was created before the installation with root account.

• Extensions button is missing.

Cause

• Incorrect permissions on /opt/psa/var/modules/ directory or one of the directories on the level above.

Resolution

1. Set the correct permissions on directory:

# chown psaadm:root /opt/psa/var/modules/

2. Repair Plesk installation by pressing Repair button in Tools & Settings > Diagnose & Repair menu. Alternatively, run the command below in CLI:

# plesk repair installation