Comment by linsomniac

ProTip: You can switch back to Gnu coreutils on 26.04 with:

apt install coreutils-from-gnu coreutils-from-uutils- --allow-remove-essential

And pin it so an upgrade doesn't flip it back with:

printf 'Package: coreutils-from-uutils\nPin: release a=*\nPin-Priority: -10\n' \ | sudo tee /etc/apt/preferences.d/uutils > /dev/null