Comment 6 for bug 1582011

I first installed Ubuntu 32-bit desktop some years ago (I believe 11.04) and have been upgrading it every six months. I am now up to 16.04 and have not ever experienced this shutdown problem.

Since Chrome no longer supports 32-bit, I have downloaded 16.04 64-bit (and verified the sha256).

I have burned the 64-bit to both DVD and thumb drives. I can boot live from either and shutdown without a problem.

If I install to a brand new SSD, I hang during shutdown.

If I replace the SSD with the original HDD with 16.04 32-bit, I can shutdown without problem.

I have found several suggestions on the Web to modify the /etc/default/grub file to solve the problem. My two /etc/default/grub files are identical so I don't see that as a problem.

None of the following work, they just hang:
  shutdown -h now
  shutdown -P now
  reboot -p
  sudo reboot -f (Just responds “Rebooting” and then nothing.)
  sudo halt
  poweroff

In summary, 11.04 (32-bit) upgraded to 11.10 upgraded to 12.04 upgraded to ... 16.04 shuts down without a problem while 16.04 clean install hangs.

Maybe, given time, I'll download 16.04 32-bit and do a clean install to see what that will do.