Laptop doesn't shut down - Lubuntu 15.04

Solution 1:

First this is bug #1464917:

If you think this bug is affecting you please report it to the bug link above, thank you.

Update:

There has been a development as a work around to this bug. It seems to be related to the swap file usage/management. Adam (from the bug link above) points out that if you turn your swap off, wait for it to process, before you shutdown the hang never happens. When you are ready to shutdown your machine, open a terminal window and type;

sudo swapoff -a

Wait for the command to process and give your prompt back then you should be able to perform normal shutdown. This is working for many including me.

end update

If the shutdown or reboot has hanged with this message Reached target Shutdown

Try Sysrq

1. Hold down the Alt and SysRq (Print Screen) keys.
2. While holding those down, type the following keys in order, several seconds apart: REISUB
3. Computer should reboot.

You can also try the following after it hangs.

see if you can login tty1 and reboot

1. Press Ctrl+Alt+F1 or Ctrl+Alt+F2 or Ctrl+Alt+F3 ...
2. Write your username (lowercase, the name of the user folder in /home) and hit Enter
3. Write your password (nothing will appear) and hit Enter

If your password and username are correct, you are now logged in.

If that fails try Ctrl+Alt+Del a couple times at that point in the tty1 screen

You might see a message that states the machine is going to reboot and then it should do just that after a minute or so.

Its better than a hard boot - until its fixed

In the bug notes it is reported that you can upgrade to Vivid-Proposed and it fixes the issue but some still see this after that upgrade. It might be worth a shot.

Btw the same bug affects me and I have not tried the upgrade yet but the steps I listed do work.

Solution 2:

I have Lubuntu 16.04.1 LTS

STEPS I DID FOR SOLVE

• Press CTRL + ALT and T
• In terminal paste sudo xedit /etc/modprobe.d/blacklist.conf
• Write your user password
• In the bottom of the windows add:

blacklist dw_dmac blacklist dw_dmac_core

• Save and Quit
• I did Follow step, but don't know if is neccesary: In the same terminal add: sudo update-grub
• Reboot once (maybe could keep with issue, force reboot) Thats It. I Did it and the PC now colud PowerOff/Reboot/Suspend and everything.

NOTICE: For this to work you will need to eraser quite splash in the Grub Steps for this:

• Press CTRL + ALT and T (open the terminal)
• Paste this sudo xedit /etc/default/grub
• Write your user password
• In the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" eraser quiet splash
• Save and Quit
• In terminal paste sudo update-grub

Notes: This work for ASER E-11 with previous Windows8.1 and now with Lubuntu 16.04.1 LTS.

Cons: In the Start or ShutDown the computer will show only console, but It'll works.