I have a problem regarding to Daryna's hibernation in which my computer cannot turn hibernated everytime I want it to. When I click on the hibernation button, the computer seems to turn off as it tries to shut down all running applications and show all activities in a black screen. But it surprisingly reverts to login window and announces that Daryna cannot be hibernated for unviable problem. Is that a well-known issue in Ubuntu and its derivatives because I have seen some past discussions about this? My computer is equiped with intel-pentium IV 2.4GHz, 1GB Ram, and I allocated 512 Mb for swap memory. Do you have any suggestion, guys?