• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

Resolved Plesk Onyx 17.0.17 to 17.5.3 update problem

Hello,

I have had the same problem.

After a quick investigation, it appears that the problem is related to a kernel failure, caused by the aa-status command that is invoked from plesk-dovecot-imap-driver.postinst
The call hangs by accessing /sys/kernel/security/apparmor/profiles (apparmor configuration)

In my case the solution has been to update the system (apt-get update / apt-get upgrade / apt-get dist-upgrade).

The update has also been blocked by the same problem with aa-status. A reboot has been necessary during the update.

To complete the process you have to process the configurations pendings: dpkg --configure -a

Now the system is working ok again.
 
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