hostnamectl|grep Op
  Operating System: Debian GNU/Linux 10 (buster)

# and also on
lsb_release -d
Description:	Debian GNU/Linux 11 (bullseye)

su - root
df -m | grep " \+/$" | awk '{print $1;}'

# because of a bug, runnig it as as non-root: results into
df: /run/user/1000/doc: Operation not permitted

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