Zentyal parou de funcionar após updates

[Henrick]

Boa noite, Após aplicar as updates sugeridas pelo Zentyal, ele parou de funcionar.
no navegador aparece apenas 404 Not Found
nginx e pelo terminal, quando eu logo aparece: Welcome to Ubuntu 12.04.5 LTS (GNU/Linux 3.11.0-18-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Mon Nov 23 19:07:29 BRST 2015

  System load:    0.0               Users logged in:     1
  Usage of /home: 0.1% of 59.46GB   IP address for eth0: 201.80.188.248
  Memory usage:   3%                IP address for eth2: 192.168.0.11
  Swap usage:     0%                IP address for eth3: 10.10.0.1
  Processes:      121

  Graph this data and manage this system at:
    https://landscape.canonical.com/

This is a Zentyal Server Community edition.



Your current Hardware Enablement Stack (HWE) is no longer supported
since 2014-08-07.  Security updates for critical parts (kernel
and graphics stack) of your system are no longer available.

For more information, please see:
http://wiki.ubuntu.com/1204_HWE_EOL

The following packages are no longer supported:
 linux-headers-3.11.0-15 linux-headers-3.11.0-26 linux-signed-image-3.11.0-15-ge                             neric linux-image-3.11.0-18-generic linux-headers-generic-lts-saucy linux-header                             s-3.11.0-18-generic linux-signed-image-3.11.0-18-generic linux-image-3.11.0-15-g                             eneric linux-headers-3.11.0-18 linux-headers-3.11.0-15-generic linux-headers-3.1                             1.0-26-generic

Please upgrade them to a supported HWE stack or remove them if you
no longer need them.


Last login: Mon Nov 23 18:25:10 2015 from 192.168.0.142
root@firewall-2:~#
Não faço ideia de como restaurar o Zentyal... Por favor, caso alguém possa me ajudar... Obrigado!!