kubuntu se apaga solo

[ingapayan]

ok, he mirado y sobre la hora que se apagó aparece lo siguiente:
Dec 17 14:13:43 ingrid-laptop kernel: [ 25.592000] No dock devices found.
Dec 17 14:13:44 ingrid-laptop kernel: [ 26.900000] r8169: eth0: link down
Dec 17 14:13:44 ingrid-laptop kernel: [ 26.904000] ADDRCONF(NETDEV_UP): eth0: link is not ready
Dec 17 14:13:45 ingrid-laptop kernel: [ 27.900000] ppdev: user-space parallel port driver
Dec 17 14:13:45 ingrid-laptop kernel: [ 28.204000] audit(1197900825.406:3): type=1503 operation="inode_permission" requested_mask="a" denied_mask="a" name="/dev/tty" pid=5358 profile="/usr/sbin/cupsd"
Dec 17 14:13:45 ingrid-laptop kernel: [ 28.372000] apm: BIOS not found.
Dec 17 14:13:47 ingrid-laptop kernel: [ 30.368000] Failure registering capabilities with primary security module.
Dec 17 14:13:47 ingrid-laptop dhcdbd: Started up.
Dec 17 14:13:49 ingrid-laptop kernel: [ 31.788000] Bluetooth: L2CAP ver 2.8
Dec 17 14:13:49 ingrid-laptop kernel: [ 31.788000] Bluetooth: L2CAP socket layer initialized
Dec 17 14:13:50 ingrid-laptop kernel: [ 33.192000] Bluetooth: RFCOMM socket layer initialized
Dec 17 14:13:50 ingrid-laptop kernel: [ 33.192000] Bluetooth: RFCOMM TTY layer initialized
Dec 17 14:13:50 ingrid-laptop kernel: [ 33.192000] Bluetooth: RFCOMM ver 1.8
Dec 17 14:14:37 ingrid-laptop exiting on signal 15

qué interpretas?