- Plesk for Linux
Plesk upgrade hangs on the following step:
PLESK_INFO: Setting up plesk-dovecot-imap-driver
It is not possible to switch from Courier to Dovecot via Plesk Installer.
The server has a kernel version older than 4.4.0-66-generic:
# uname -r
AppArmor is enabled on the server:
apparmor module is loaded.
This is an Ubuntu bug, which may occur when a server has an old kernel and AppArmor is enabled.
Either upgrade kernel to the version at least 4.4.0-66-generic or temporary disable AppArmor and perform a Plesk upgrade/installation of Dovecot.