I still have this problem, but I have solved it.
I create files
file: /etc/systemd/system/kill-plymouthd.service
[Unit]
Description=kill plymouthd
After=umount.target
DefaultDependencies=false
[Service] Type=oneshot
ExecStart=/usr/bin/pkill plymouthd
[Install] WantedBy=final.target
file: /etc/systemd/system/rm-nvidia.service
[Unit]
Description=rm nvidia modules
After=umount.target
DefaultDependencies=false
[Service] Type=oneshot
ExecStart=/usr/sbin/rmmod nvidia_uvm
ExecStart=/usr/sbin/rmmod nvidia_drm
ExecStart=/usr/sbin/rmmod nvidia_modeset
ExecStart=/usr/sbin/rmmod nvidia
ExecStart=/usr/sbin/rmmod i2c_nvidia_gpu
[Install]
WantedBy=final.target
execute:
sudo systemctl daemon-reload
sudo systemctl enable rm-nvidia.service
sudo systemctl enable kill-plymouthd.service
for debug this problem i installed finalrd ane created executable
/etc/finalrd/sleep.finalrd
#!/bin/sh
set -x
if [ "$1" = "setup" ] then
. /usr/share/initramfs-tools/hook-functions
copy_exec /usr/bin/sleep
copy_exec /usr/bin/mount
exit 0
fi
#your debug script
mount
sleep 30
i have second system with ubuntu and in this second system i do not have
nvidia drivers and i only created kill-plymouthd.service and this also
work.
and i did know why plymouthd is not killed befor umount root fs..
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https://bugs.launchpad.net/bugs/1928200
Title:
Prompt error message "Failed to unmount /oldroot" when shutdown or
reboot
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