I had ubuntu 14.04 (DELL laptop INSPIRON N-4110 ) shutdown and reboot worked correctly and without any problem but after a long time I wasn't able to reboot or shutdown my machine.

and that was the log message was shown by pressing Esc during shutdown:

killing all procceses [fail]

and I tried all the tips I saw in askubuntu and others(like changing the grub and shutdown - h now etc none of them have worked ! )

then I clean installed ubuntu 16.04 (current) but issue is not going to solve.

now the log shows:

[ok] Reached target Shutdown [135.486156] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0X0 action 0x6 frozen [135.846776] ata2.00: cmd a0/00: 00:00:00:00/00:00:00:00:00/s0 tag 4 pio 16392 in [135.846776] get event status notification 4a 01 00 10 00 00 00 00 00res 40/00:00:00:00 [135.848020] ata2.00:status: { DRDY } [141.182090] ata2.00 revalidation failed (errno=-5)
I checked bug #1464917 and did instructions also but nothings changed .


after updating to 16.04.1 (boot install) Ubuntu will shutdown if i do it fast when OS is coming up but after a while it's not going to power off again and Esc key won't work and does not show me log any more

UPDATE(PROBLEM SOLVED) : It was a certain hardware problem and solved by changing Hard Disc


Maybe the swap is still active when reaching "Target shutdown"; My solution was to force swap deactivation before reboot :

 swapoff -a
 swapoff /dev/md6

after that, the reboot went fine for me without any pause.

  • 1
    I have exactly the same annoying problem. Where do you put these two lines? – horaceT May 11 '17 at 1:04

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