@Phil_Claffey, It sounds like you are experiencing what is currently a fairly common issue; but maybe not... If so, though, an easy workaround may be in order for you.
I don't know if your update fixed your shutdown lag; but there are a half dozen risky commands to breeze past this annoying issue, as well as what you do: [quote="Phil_Claffey, post:1, topic:6388"]
I have to hold down the power button at the moment in order to turn it off.
[/quote]
Whatever is causing it may never be found, e.g., systemd bugs, lagging daemons, programs that won't quit, or any number of other shutdown/reboot issues. But a good, safe, workaround (community link below) will help you forget about it.
Please try this the next time it hangs: Magic SysRq key trick
(If you don’t have a SysRq key use the PrintScrn key instead)
Hold ALT + SysRq and while holding type reisuo.
It’s not a fix for your problem but it might be better than a hard reboot
Hi Phil,
I have the same problem. It is caused by Intel bay trail cores and the bug is affecting many.
I have a solution which isn’t the best but still good and valid for Ubuntu 18.04 users too.
Solution:
first open terminal by pressing ctl+alt+T
then type the following commend : sudo gedit /etc/default/grub
find and edit GRUB_CMDLINE_LINUX_DEFAULT="quite splash" into GRUB_CMDLINE_LINUX_DEFAULT="intel_idle.max_cstate=1"
Then save and close the grub
Now you have to update Grub, just use the following commend sudo update-grub
Turn off your laptop forcefully for one last time cause after that you are not going to have this problem after you Boot it up again.
Hope it helps