I believe the answer is because the of ZFS filesystem, including /boot. Grub can not read ZFS filesystems, my understanding that is in development.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1873008 Title: package lubuntu-grub-theme (not installed) failed to install/upgrade: error creating symbolic link './boot/grub/themes/lubuntu-grub- theme/icons/ubuntu.png': Operation not permitted - symbolic link on vfat filesystem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lubuntu-artwork/+bug/1873008/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
![[Bug 1873008] Re: package lubuntu-grub-theme (not installed) failed to install/upgrade: error creating symbolic link './boot/grub/themes/lubuntu-grub-theme/icons/ubuntu.png': Operation not permitted - symbolic link on vfat filesystem](/search?l=ubuntu-bugs@lists.ubuntu.com&q=subject:%22%5C%5BBug+1873008%5C%5D+Re%5C%3A+package+lubuntu%5C-grub%5C-theme+%5C%28not+installed%5C%29+failed+to+install%5C%2Fupgrade%5C%3A+error+creating+symbolic+link+%27.%5C%2Fboot%5C%2Fgrub%5C%2Fthemes%5C%2Flubuntu%5C-grub%5C-theme%5C%2Ficons%5C%2Fubuntu.png%27%5C%3A+Operation+not+permitted+%5C-+symbolic+link+on+vfat+filesystem%22&o=newest){kind=link}
