Installation fails on Arch Linux because tar cannot change ownership on FAT EFI partition

[Belarusan]

• Arch Linux
• GNU tar 1.35
• multios-usb 0.11.1-1 (from AUR)

On Arch Linux installation fails during GRUB extraction.

Command tar -xf binaries/grub-*/i386-pc.tar.xz -C "$part_efi/grub" produces many errors:

tar: i386-pc/*.mod: Cannot change ownership to uid 0, gid 0: Operation not permitted

The EFI partition is FAT32, which as far as I know does not support Unix ownership.

The installation succeeds after changing the command to:

tar --no-same-owner -xf binaries/grub-*/i386-pc.tar.xz -C "$part_efi/grub"

Maybe this option should be added upstream.

[ebbez]

• Subscribed to issue (AUR-maintainer), will also try to reproduce when I'm able to, but indeed sounds like more of a problem in upstream.

[ebbez]

Hi @Belarusan, I've tried reproducing the issue but I'm unable to.

I've got a PKGBUILD ready with

sed -i -E 's/(tar\s+)(.*\$part_efi.*)/\1--no-same-owner \2/g' "$_pkgname-$pkgver/multios-usb.sh"

in the prepare() function.

[Belarusan]

Hello @ebbez, I’d prefer not to discuss identities across platforms.

Thanks for checking. I’m not sure what the difference between our setups is. I can only confirm that on my system the issue disappears when --no-same-owner is added.

[Mexit]

tar: i386-pc/*.mod: Cannot change ownership to uid 0, gid 0: Operation not permitted

I was also unable to reproduce this error. I checked it directly on the live image archlinux-2026.08.01-x86_64.