あっはーん?chroot抜けるの忘れてた。
root@raspberrypi:~# umount $PI/run
root@raspberrypi:~# umount $PI/sys
root@raspberrypi:~# umount $PI/proc
root@raspberrypi:~# umount $PI/dev/pts
root@raspberrypi:~# umount $PI/dev
root@raspberrypi:~# umount /dev/sda1
umount: /dev/sda1: umount failed: No such file or directory.
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???Ⓜ️ (joojak@toot.blue)'s status on Saturday, 11-Feb-2023 21:58:24 JST???Ⓜ️