Public bug reported:

with
GRUB_DISABLE_OS_PROBER=true
the time wasted is significantly reduced, but repetitive calling of 
zz-update-grub is still an unnecessary annoying waste of time.

perhaps the solution could be something like defer it and trigger it at
the end.

here's an example of repetitive calling of zz-update-grub:
  #  apt-get --purge --auto-remove install stalonetray                          
                                                                                
          
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  linux-headers-4.4.0-78* linux-headers-4.4.0-78-generic* 
linux-image-4.4.0-78-generic* linux-image-extra-4.4.0-78-generic*
The following NEW packages will be installed:
  stalonetray
0 upgraded, 1 newly installed, 4 to remove and 23 not upgraded.
Need to get 70.7 kB of archives.
After this operation, 297 MB disk space will be freed.
Do you want to continue? [Y/n] 
Get:1 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 stalonetray 
amd64 0.8.1-1 [70.7 kB]
Fetched 70.7 kB in 0s (208 kB/s)     
(Reading database ... 248305 files and directories currently installed.)
Removing linux-headers-4.4.0-78-generic (4.4.0-78.99) ...
Removing linux-headers-4.4.0-78 (4.4.0-78.99) ...
Removing linux-image-extra-4.4.0-78-generic (4.4.0-78.99) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-78-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
Found linux image: /boot/vmlinuz-4.4.0-79-generic
Found initrd image: /boot/initrd.img-4.4.0-79-generic
Found linux image: /boot/vmlinuz-4.4.0-78-generic
Found initrd image: /boot/initrd.img-4.4.0-78-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-extra-4.4.0-78-generic 
(4.4.0-78.99) ...
Removing linux-image-4.4.0-78-generic (4.4.0-78.99) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-78-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
Found linux image: /boot/vmlinuz-4.4.0-79-generic
Found initrd image: /boot/initrd.img-4.4.0-79-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-4.4.0-78-generic (4.4.0-78.99) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-78-generic 
/boot/vmlinuz-4.4.0-78-generic
Selecting previously unselected package stalonetray.
(Reading database ... 215994 files and directories currently installed.)
Preparing to unpack .../stalonetray_0.8.1-1_amd64.deb ...
Unpacking stalonetray (0.8.1-1) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up stalonetray (0.8.1-1) ...
  #

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grub-pc 2.02~beta2-36ubuntu3.12
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: LXDE
Date: Mon Aug  7 09:21:51 2017
InstallationDate: Installed on 2016-10-15 (295 days ago)
InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1709098

Title:
  repetitive calling of zz-update-grub

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