Issue Update to 18.7.11 always fail...

[PIRITEL]

Hi on a working machine with
‪Ubuntu 16.04.5 LTS‬
Producto Plesk Onyx
Versión 17.5.3 Actualización #59, última actualización el 16/Oct/2018 22:41
when updates to 17.8.11 always the update crashes on same point
Installing new version of config file /etc/plesk-release ...
Setting up plesk-dovecot (2.3.0.1-ubuntu16.04.18031217) ...
Setting up plesk-dovecot-pigeonhole (0.5.0.1-ubuntu16.04.18031217) ...
Setting up plesk-dovecot-imap-driver (17.8.11-ubuntu16.04.build1708180920.18) ...
And the server crashes and cant acces to a panel and no ssh to server, needs to restore a full backup.
Googling have seen that its a dovecot mail system but no look to resolve it...
Any suggestion?

Thanks