How to fix lubuntu restart/shutdown problem?

Question

linux

All the best!
I can’t remember after what specifically, but my computer with lubuntu on board stopped rebooting or turning off through the commands reboot , shutdown -r now , poweroff and so on ... I
already tried all the options I found with editing grub but without results

GRUB_CMDLINE_LINUX=”reboot=efi”
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"

First, there is a process of shutting down the work, but at one moment (each time in a different way), this process stops and nothing happens further.
Unless the command
$(sync;echo s > /proc/sysrq-trigger;echo 1 > /proc/sys/kernel/sysrq;sync;echo b > /proc/sysrq-trigger)
overloads...