Symptoms
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Updating system packages through Plesk fails on the RHEL 8.5 based distros (RHEL/CentOS/AlmaLinux)
'NoneType' object has no attribute 'run_sack'
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The issue does not occur on the RHEL 8.4 based distributions.
Cause
Product issue PPPM-13304, fixed in release 18.0.39.
Resolution
Update Plesk to the fixed version (recommended).
If an update is not possible, patch the panel manually.
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Connect to the server over SSH
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Run this command to replace the updater with the patched version
# cp -a /usr/local/psa/admin/sbin/pum_worker{,.bak} && wget -O /usr/local/psa/admin/sbin/pum_worker https://support.plesk.com/hc/en-us/article_attachments/12387464256023 && chmod 750 /usr/local/psa/admin/sbin/pum_worker