Dear coreutils devs,
I'm the dev of the 'boot-repair' and 'boot-info' utilities.
A Linux Mint 20.2 user reported the following system information: https://paste.ubuntu.com/p/kcXPDC79RF/ (pastebin will expire so I attach a copy)
Interesting extract for you, is that line 20 shows unusual df output (negative value for 'Used' , and a dash for Use% ):
$ df /dev/nvme0n1p3 | grep / Filesystem 1K-blocks Used Available Use% Mounted on /dev/nvme0n1p3 134210720 -39573944 173784664 - /mnt/boot-sav/nvme0n1p3