1- Solution 1: run in terminal:
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sudo shutdown -P now
2- Solution 2:
Step 1: Go to terminal and type
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sudo gedit /etc/default/grub
It will open the grub file. Change the line
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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" acpi=force apm=power_off
Step 2: Again hit the terminal and type
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sudo gedit /etc/modules
It will open the modules - just type apm power_off=1 below lp and save the file.
Step 3: Next type in the terminal
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sudo update-grub
In addition, you may need to modify ACPI configuration to enable smooth shutdown. To do so, type the following in the terminal.
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sudo modprobe -rf rt2860sta
sudo modprobe rt2860sta
echo blacklist rt2800pci | sudo tee -a /etc/modprobe.d/blacklist.conf
Once you restart your computer, your shutdown would be proper and things won't hang at shutdown.
3- Solution 3:
You can get a patch for mountall from a ppa that will allow you to remove plymouth but this is not going to help this problem which is caused by libplymouth2.
You need libplymouth2. You need to file a bug on this or find one that you can join;
Code:
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ubuntu-bug libplymouth2