ubuntu 12.04 LTS how to avoid GRUB update‏

[Spyros Tsiolis]

Hello all,

About three years ago, I decided to migrate a clients' installation from Windows XP to
ubuntu 12.04.

A brief description of the installation : an ubuntu server 14.04 LTS X64 on an HP Blade
running on top of VMware and for the clients, all PCs are transformed from Hard Disk
Bloatware (XP) to being used as thin clients.

The thin clients, use (through PXE) ubuntu 12.04 LTS.

I never had a problem with the installation; It works fine day in day out.
Heck I don't even have to tell the clients to shutdown in case I perform the Ubuntu
updates; whether that be the Ubuntu server on the blade or the actual thin-client
software that updates regularly.

Here's my problem though.
These last days, when the system fetches out to the internet to get the updates,
it comes up with grub2 update which doesn't apply for the thin clients since they
boot from the network and there are no hard drives in them.

I searched a lot of pages on the net ; however I cannot find a fitting solution.

What I would like to do is "tell" the system to ignore Grub2 update and get on with
the rest of the updates. However, the system complains that it cannot do that and
refuses to update.

Can someone point me to the right direction ?

thank you all for your patience and time,

s.