Comment 17 for bug 1720930

Gilbert Standen (gstanden) wrote :

Workaround #1:

I can confirm that on Lenovo P70 Mobile Workstation running Artful Aardvark 17.10 an upgrade to kernel 4.13.6 or higher prevented the hang on "wlp4s0: failed to remove key" (although as mentioned the error still appears in the shutdown sequence).

Workaround #2

I also found that if I went into /etc/default/grub" and removed "quiet splash", i.e. change:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

GRUB_CMDLINE_LINUX_DEFAULT=""

and then run:

sudo update-grub

and reboot the hang also goes away without any need to upgrade to a higher kernel version (i.e. this fix works with the latest pushed kernel:

Linux athens 4.13.0-16-generic #19-Ubuntu SMP