Comment 97 for bug 736743

For Information purposes only

Kubuntu 23.10

"error: sparse file not allowed. Press any key to continue ..."

It's not a problem, because a message appears for a few seconds and then the system boot continues by itself.

I added 2 lines to the Grub.
/etc/default/grub
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true

/etc/fstab
/ btrfs defaults,subvol=@ 0 1
/home ext4 defaults 0 2
/boot/efi vfat umask=0077 0 1

fdisk -l
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Device Start End Sectors Size Type
/dev/sdX 2048 66447359 66445312 31,7G Linux filesystem ///system on btrfs
/dev/sdX 66447360 125042687 58595328 27,9G Linux root (x86) ///home on ext4
/dev/sdX 2048 1050623 1048576 512M EFI System ///boot/efi