Unable to update System Packages on the RHEL-based OS of version 8.5 (RHEL/CentOS/AlmaLinux) in Plesk > Tools & Settings > Update Settings > Available Updates or the corresponding email is received:
'NoneType' object has no attribute 'run_sack'
The issue does not occur on the RHEL-based OS of version 8.4.
#PPPM-13304 "Plesk Update Manager no longer fails with the “‘NoneType’ object has no attribute ‘run_sack’” error. We have spotted this issue in Plesk Obsidian 18.0.39 Update 1 on CentOS 8.5, AlmaLinux OS 8.5, RHEL 8.5, CloudLinux OS 8.5."
- Plesk Obsidian 18 November 2021 (Linux)
If update is not possible for some reason you may try the following