PC with Kubuntu doesn't turn off

I have a PC with Kubuntu and I cannot turn my PC off, when I try to do it with the classic option from the menu it just remains a black screen (literally) but the PC remains active. I can do it with the command sudo shutdown -h now, so I guess it is about permissions, but I don't know which files to touch. I tried to update the file /etc/default/grub modifying the line into:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"

and I executed sudo update-grub, but it didn't work. Can someone help? I hope I have not posted it in the wrong place (Kubuntu).

I want to add: I had some problems with a corrupted disk 2 months ago, it was repaired doing a fdisk from the partition with contains a Windows version. After that the problem started.

1 Sorted by: Reset to default

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