Grub bug report

Narcis Garcia informatica at
Mon Mar 28 08:58:54 UTC 2016

If you want Windows entries not appears in GRUB menu, you can disable
the detection of other operating systems:
chmod a-x /etc/grub.d/30_os-prober

Than you can run update-grub with Windows HDD plugged, and menu will not
include MS/Windows boot.
Usually, when GRUB has no different OS to show in the menu, it's
configured hidden to boot faster. If you want to discover the menu, you
must hold [Shift] key at boot manager stage.

El 28/03/16 a les 02:32, Ty Young ha escrit:
> On 03/27/2016 04:24 AM, Narcis Garcia wrote:
>> Do you want to use GRUB With or Without Windows?
>> Then will you update-grub With or Without Windows HDD plugged?
> Without. The test that I just did was without Windows, though normally
> it is plugged in during updates.
>> El 27/03/16 a les 00:26, Ty Young ha escrit:
>>> Sent this earlier with an image attached but the size was too big and it
>>> needed to be approved by a mod. I'll just include a link instead...
>>> On 03/25/2016 03:40 AM, Narcis Garcia wrote:
>>>> I suppose the only thing to seem disappeared is GRUB's menu (hidden to
>>>> be more precise).
>>>> If you already boot to GNU/Linux (Ubuntu), the command "update-grub"
>>>> will rebuild menu's entries with plugged volumes that have operating
>>>> systems.
>>> I removed my Windows HDD and did update-grub and I can still boot into
>>> Ubuntu Gnome. This is what it gave for output, if it helps any:
>>>> El 25/03/16 a les 08:12, Ty Young ha escrit:
>>>>> On 03/25/2016 01:58 AM, Tim wrote:
>>>>>> On 25/03/16 17:12, Ty Young wrote:
>>>>>>> I've personally never used update-grub before, so unless the command
>>>>>>> was given by an update, no.
>>>>>> Yes it will get triggered by system updates from time to time, so it
>>>>>> would be worth trying and see if breaks things. A reproducible bug is
>>>>>> much
>>>>>> better than one that says "things break after a random reboot"!
>>>>> Just update-grub? No special arguments/options? I'll try that tomorrow
>>>>> and see what happens.
>>>>> Yeah, sorry about that. I said that because I have no clue what
>>>>> could be
>>>>> causing it. I hadn't installed any grub updates in a long time and
>>>>> I've
>>>>> only recently upgraded the kernel to 4.5, the only times I would think
>>>>> update-grub would run.
>>>>> I swear this has happened without even installing updates before
>>>>> though.
>>>>> Guess I'll found out tomorrow when I run it...
>>>>>>> I run Windows 7 and Ubuntu Gnome on separate hard drives. I had
>>>>>>> unplugged the Windows 7 HDD for the boot-repair.
>>>>>>> Don't think so since it happens when restarting from Ubuntu Gnome
>>>>>>> and
>>>>>>> never from Windows 7 to Ubuntu Gnome if the option was there before
>>>>>>> restarting Ubuntu Gnome.
>>>>>> OK, its probably not from windows then
>>>>>>> If it matters any, I get a duplicate UEFI entry for Ubuntu, named
>>>>>>> after the hard drive model(Model: ST3750528AS). If i select it, the
>>>>>>> screen
>>>>>>> flashes blue and enters grub as normal(or looks normal, anyway).
>>>>>> I don't have any UEFI hardware still, so not entirely sure about
>>>>>> this.
>>>>>> But I believe the UEFI entries are added by the OS, maybe you can use
>>>>>> efibootmgr to remove the dupe. No idea if this is causing your issues
>>>>>> though.

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