In 12.04 LTS, hibernate (suspend to disk) has been disabled by default, as it was found to be unreliable, very slow and confusing to have two suspend modes. See bug 812394 for details. If you want to re-enable it, please follow https://help.ubuntu.com/12.04/ubuntu-help/power-hibernate.html
In 12.04 LTS, hibernate (suspend to disk) has been disabled by default, as it was found to be unreliable, very slow and confusing to have two suspend modes. See bug 812394 for details. If you want to re-enable it, please follow https:/ /help.ubuntu. com/12. 04/ubuntu- help/power- hibernate. html