GNOME 16.04 Reboot after Shutdown

Question

My PC always reboots 5 seconds after its turned off. I looked at Reboot after shutdown (Ubuntu 14.04 (also 12.04); Dell latitude E7440), but:

• the top rated answer didn't help since I have no power options in the F2 menu. I changed wake on lan to disable, didn’t help.

• The 2nd answer had 3 steps. I did step 1 and 3. Didn’t help. When I enter the command for step 2 the terminal is empty.

If it helps, I have an acer v5-571.

cat /proc/acpi/wakeup:

Device  S-state   Status   Sysfs node
P0P1      S4    *disabled
GLAN      S4    *disabled
EHC1      S3    *enabled   pci:0000:00:1d.0
EHC2      S3    *enabled   pci:0000:00:1a.0
XHC   S3    *enabled   pci:0000:00:14.0
HDEF      S3    *disabled  pci:0000:00:1b.0
RP01      S4    *disabled  pci:0000:00:1c.0
PXSX      S4    *disabled
RP02      S4    *disabled
PXSX      S4    *disabled
RP03      S5    *disabled  pci:0000:00:1c.2
PXSX      S5    *disabled  pci:0000:02:00.0
        *disabled  platform:rtsx_pci_sdmmc.0
        *disabled  platform:rtsx_pci_ms.0
RP04      S4    *disabled  pci:0000:00:1c.3
PXSX      S4    *disabled  pci:0000:03:00.0
RP05      S4    *disabled
PXSX      S4    *disabled
RP06      S4    *disabled
PXSX      S4    *disabled
RP07      S4    *disabled
PXSX      S4    *disabled
RP08      S4    *disabled
PXSX      S4    *disabled
PEG0      S4    *disabled
PEGP      S4    *disabled
PEG1      S4    *disabled
PEGP      S4    *disabled
PEG2      S4    *disabled
PEG3      S4    *disabled
LID0      S3    *enabled   platform:PNP0C0D:00
SLPB      S3    *enabled   platform:PNP0C0E:00

So, in the other thread you posted to me, he had XHC EHC1 EHC2 as the sources of the reboot, so I tried to take the shortcut and disable them as well, but again (maybe because I lack a word like with the last command), my access is denied.

I entered his solution:

for device in XHC EHC1 EHC2; do
    if grep -Fe "$device" /proc/acpi/wakeup | grep -qFe enabled; then
        echo "Disabling wakeup on $device"
        echo "$device" > /proc/acpi/wakeup
    fi
done

Unfortunately the format isn’t kept, so it is a bit of a mess, hope you still see through.