Hello,

Sorry I had to leave this for a few days ...
Anyway I believe I have discovered where the problem lies. First things 
first, booting with kernel  '3.16.0-43-generic' works OK.

The other thing I discovered (latest kernel) is that if my TV tuner is 
active the system won't boot. The light on the tuner goes out after the 
boot starts and the system hangs. When I power down and restart the 
light is out and will come on again after I see the 'ACPI PCC Probe 
failed starting version 219' and the system boots. If I disconnect the 
tuner from scratch before switching on the system boots OK with the 
latest kernel.

This also explains why I noticed that it would boot OK after using 
Windows first as it switches the tuner off on shutdown / restart.

So it looks like the problem is with the TV tuner or the driver more 
likely, but only with the latest kernel. Its a fairly old tuner - DVICO 
usb (AU version) - and all I did to install it was to download 
"http://www.linuxtv.org/downloads/firmware/dvb-usb-bluebird-01.fw"; and 
copy to /lib/firmware. I use MeTV.

Hopefully this helps. Again, any advice / tips much appreciated.

Regards.

Tony

On 04/08/15 02:33, Joseph Salisbury wrote:
> Will the system boot if you select the previous kernel from the GRUB
> menu?
>
> ** Changed in: linux (Ubuntu)
>     Importance: Undecided => High
>
> ** Tags added: kernel-da-key
>

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https://bugs.launchpad.net/bugs/1480642

Title:
  systemd-boot

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