[Breeze] [Bug 435473] New: grub-theme-breeze fails to install on KDE Neon with ZFS on root

[Jonas]

https://bugs.kde.org/show_bug.cgi?id=435473

            Bug ID: 435473
           Summary: grub-theme-breeze fails to install on KDE Neon with
                    ZFS on root
           Product: Breeze
           Version: 5.21.4
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: GRUB
          Assignee: plasma-devel at kde.org
          Reporter: kdebugs at l3m.ch
                CC: sitter at kde.org
  Target Milestone: ---

SUMMARY

Error message:

Preparing to unpack
.../grub-theme-breeze_5.21.4-0xneon+20.04+focal+release+build24_amd64.deb ...
Unpacking grub-theme-breeze (5.21.4-0xneon+20.04+focal+release+build24) over
(5.21.3-0xneon+20.04+focal+build23) ...
dpkg: error processing archive
/var/cache/apt/archives/grub-theme-breeze_5.21.4-0xneon+20.04+focal+release+build24_amd64.deb
(--unpack):
 unable to make backup link of './boot/grub/themes/breeze/progress_bar2_c.png'
before installing new version: Operation not permitted
dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
Errors were encountered while processing:

/var/cache/apt/archives/grub-theme-breeze_5.21.4-0xneon+20.04+focal+release+build24_amd64.deb
ZSys is adding automatic system snapshot to GRUB menu
E: Sub-process /usr/bin/dpkg returned an error code (1)


STEPS TO REPRODUCE
1. Have KDE neon on ZFS filesystem with grub-theme-breeze in a version older
than 5.21.4
2. apt update && apt dist-upgrade


OBSERVED RESULT

Package fails to install.


EXPECTED RESULT

Package can be installed without error.


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon 5.21 User Edition
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

It's possible to manually copy the images from an extracted package to the
target folder, but installing the package fails.
Likely also related to this:
https://bugs.launchpad.net/ubuntu/+source/lubuntu-artwork/+bug/1873008

Related entries from /etc/fstab:

# /boot/efi was on /dev/nvme0n1p3 during installation
UUID=(some uuid)  /boot/efi       vfat    umask=0022,fmask=0022,dmask=0022     
0       1
/boot/efi/grub  /boot/grub      none    defaults,bind   0

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