I did:
sed -i 's/for s in \$SUITE \$EXTRA_SUITES; do/for s in $EXTRA_SUITES
$SUITE; do/g' /usr/share/debootstrap/functions
debootstrap --keyring=/usr/share/keyrings/debian-ports-archive-
keyring.gpg --extra-suites=unreleased --include=debian-ports-archive-
keyring sid chroot http://deb.debian.org/debian-ports
It failed with a different error this time:
I: Extracting apt...
I: Extracting base-files...
E: Tried to extract package, but tar failed. Exit...
Tail of debootstrap.log:
2025-08-16 09:48:49 URL:http://deb.debian.org/debian-ports/pool/main/
x/xkeyboard-config/xkb-data_2.42-1_all.deb [789736/789736] -> "/root/
chroot//var/cache/apt/archives/partial/xkb-data_2.42-1_all.deb" [1]
2025-08-16 09:48:49 URL:http://deb.debian.org/debian-ports/pool-hurd-
amd64/main/z/zlib/zlib1g_1.3.dfsg+really1.3.1-1+b1_hurd-amd64.deb
[88776/88776] -> "/root/chroot//var/cache/apt/archives/partial/
zlib1g_1%3a1.3.dfsg+really1.3.1-1+b1_hurd-amd64.deb" [1]
tar: ./bin: Cannot create symlink to 'usr/bin': File exists
tar: Exiting with failure status due to previous errors