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Software updater snuck in a package that is unwanted

Please stop the unnecessary hyperbole and misuse of incendiary terms to
mean things that no one else understands them to mean.

> That is why I regard the package as a trojan.
> It can not be simply and easily and cleanly, removed.

Utterly ridiculous.  That is not even close to what "trojan" means.

The kernel can't be removed... is that a trojan?  You can't remove GNU
libc, is that a trojan as well?

Trojan has a well-understood, and pejorative, meaning.  By defaming
anything that doesn't work the way you want it to as a "trojan" you're
insulting the people who work hard to provide you with amazing software
at no charge.

> Its design hooks it into other packages, to prevent its removal.

You're completely wrong.  There's nothing wrong with the design of
unattended-upgrades and it doesn't "hook into other packages".

What's happening is that other packages have declared dependencies on
unattended-upgrades, so that when you try to remove it those other
packages are marked for removal as well.

The problem, if there is one, is with those other packages not

If, instead of wailing about trojans and tossing insults around, you
actually posted relevant details of the problems you are having along
with a polite "can anyone help with this", there would be a lot less
useless back-and-forth and you'd get your problems solved much more

On Wed, 2017-10-18 at 00:54 +0800, Bret Busby wrote:
> The following packages will be REMOVED:
>    ubuntu-mate-core* ubuntu-mate-desktop* unattended-upgrades*
> 0 to upgrade, 0 to newly install, 3 to remove and 0 not to upgrade.
> After this operation, 348 kB disk space will be freed.
> Do you want to continue? [Y/n]
> "
> Therein lies the rub.

This looks like a misconfiguration/problem with your distribution
(Ubuntu MATE).  Clearly the problem is with ubuntu-mate packages:
apparently they're marked to depend on unattended-upgrades.  I don't
see this problem with my distribution (Ubuntu GNOME):

  $ sudo apt purge unattended-upgrades
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following packages will be REMOVED:
  0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
  After this operation, 319 kB disk space will be freed.
  Do you want to continue? [Y/n]

and others have reported base Ubuntu doesn't have this problem.

So, I recommend you contact the Ubuntu MATE folks and ask about this. 
Try one or more of: https://ubuntu-mate.org/community/