As simple as it sounds I cannot disable hibernation. I have disabled any GUI option to disable hibernation but my acer aspire one has decided to start hibernating after an hour.

When I first installed 12.04 on this machine I followed a tutorial to get get the suspend function working and I may have fiddled with hibernation settings as well. The real clanger to all this is hibernation doesn't work on my machine so if it hibernates I must hard reboot (holding down the power ky for 5 seconds) to boot up my machine

I don;t know where to look for what might be starting the hibernation, and cannot find the tutorial I used in the first place.

Contents of Fstab:

# /etc/fstab: static file system information.
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda6 during installation
UUID=72a8eda3-4259-4aed-a46e-32ca05f391c0 /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
#UUID=0bcc2ac9-037f-43c3-81cb-53e0c3ad68e2 none            swap    sw              0       0
/dev/mapper/cryptswap1 none swap sw 0 0
# Move /tmp to RAM
tmpfs /tmp tmpfs defaults,noexec,nosuid 0 0

Gparted screenshot https://i.stack.imgur.com/sVDRM.png

output of ls -l /dev/disk/by-uuid/

total 0
lrwxrwxrwx 1 root root 10 Sep  5 15:45 0f9e0837-2ab4-429b-9c5e-81c156ae8197 -> ../../dm-0
lrwxrwxrwx 1 root root 11 Sep  5 15:45 199020ec-61c3-4be3-aabf-0635a8b2994c -> ../../zram0
lrwxrwxrwx 1 root root 10 Sep  5 16:09 28AA883BAA880810 -> ../../sda2
lrwxrwxrwx 1 root root 10 Sep  5 16:08 509459C89459B168 -> ../../sdb1
lrwxrwxrwx 1 root root 10 Sep  5 16:09 588833E18833BC76 -> ../../sda1
lrwxrwxrwx 1 root root 10 Sep  5 15:45 72a8eda3-4259-4aed-a46e-32ca05f391c0 -> ../../sda6
  • Can I help you with getting the hibernate work well instead? Please give the output of the command free
    – TomKat
    Sep 5, 2013 at 6:52
  • Yes that would be IDEAL! total used free shared buffers cached Mem: 1931928 1750700 181228 0 116776 656232 -/+ buffers/cache: 977692 954236 Swap: 3288388 4552 3283836
    – Paul K
    Sep 5, 2013 at 7:05
  • You have enough swap; so, that's not the issue. Please try sudo pm-hibernate and tell me how it behaves now.
    – TomKat
    Sep 5, 2013 at 7:10
  • It says Not enough free swap
    – Paul K
    Sep 5, 2013 at 7:15
  • 1
    You can't hibernate because your swap is encrypted, thus it can't be read at resume time.
    – psusi
    Sep 5, 2013 at 14:57

1 Answer 1


I got your problem, Paul! [Yeah! Congratulations!]

You have enough swap, but it's not turned 'on' (or mounted). Please post the result of blkid

If you have a swap partition:

  1. Run sudo gedit /etc/fstab
  2. Add the line at the end: UUID=[the-uuid-of-swap-from-blkid] none swap sw 0 0
  3. Also follow these instructions: SwapFAQ

If you have a swapfile, go to: Use swapfile instead of partition and hibernate


  1. Open Gparted.
  2. Right-click on /dev/sda5 and click on 'swapoff' or 'delete'.
  3. Click on the 'tick' above the Disk-image.
  4. Now, right-click, and click 'new'. Create a 'swap' partition. Repeat #3.
  5. Click on 'information' on /dev/sda5.
  6. Note the UUID. Replace the UUID in your fstab (4th line from bottom, the one after 'swap was...'.
  7. Run sudo -b gedit /etc/default/grub
  8. Find the line "GRUB_CMDLINE_LINUX_DEFAULT=..." and add to it "resume=UUID=" (leave the old text as it was)
  9. sudo update-grub
  10. sudo update-initramfs -u

For blkid issue:

  1. sudo /etc/init.d/udev restart
  2. sudo update-grub
  • Thanks TomKat, but blkid doesn't return anything. I see even inside the /etc/fstab it says use this command, but mine doesn't return anything. To illustrate: user@homepc1:~$ blkid user@homepc1:~$ blkid user@homepc1:~$
    – Paul K
    Sep 5, 2013 at 7:56
  • Please edit your Q and add: 1. contents of your fstab 2. A snapshot of 'Gparted'. If you don't have Gparted, sudo apt-get install gparted Also give output of ls -l /dev/disk/by-uuid/
    – TomKat
    Sep 5, 2013 at 8:00
  • @PaulK, Your swap partition seems to be dead. Check the Update-1.
    – TomKat
    Sep 5, 2013 at 8:16
  • Well turns out that wasn't my swap rather the unencrypted grub was there, After deleting this I couldn't boot so i 'upgraded' to 13.04 so I could atleast get my encrypted documents. Now however the system is terribly slow (4 year old netbook doesn't like 13.04 although 12.04.3 was totally usable.). I'm downgrading to lubuntu so I can atleast work again.
    – Paul K
    Sep 7, 2013 at 14:18
  • Hey! You could just boot using a LIVE CD/DVD/USB and run sudo update-grub & sudo grub-install /dev/sda It'd have restored the GRUB!
    – TomKat
    Sep 20, 2013 at 13:49

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