Você fala de secureboot na UEFI né? Eu fui lá,  de "Windows" marquei pra
Other OS, mas mesmo assim não resolveu.

Antes disso eu já tentei o boot-repair, eles falam que restauram o sistema,
mas na pratica instalam um grub sem nada, aqui está o log deles:
http://paste.ubuntu.com/25460229/

2017-09-03 19:00 GMT+00:00 Rodolfo <rof20...@gmail.com>:

> Seu computador tem UEFI? Verifica isso também, no meu tive que desabilitar
> na BIOS um negócio de safe lá.
>
> 2017-09-03 14:58 GMT-04:00 Luiz Carlos <lc94...@gmail.com>:
>
>> Ele instala normalmente, mas ele não reconhece as partições.
>>
>> 2017-09-03 18:55 GMT+00:00 Rodolfo <rof20...@gmail.com>:
>>
>>> Faz isso, remove o grub:
>>>
>>> # apt-get remove --purge grub
>>>
>>> depois
>>>
>>> # apt-get install grub
>>>
>>> Obs.: Não lembro o nome do pacote do grub.
>>>
>>> 2017-09-03 14:53 GMT-04:00 Luiz Carlos <lc94...@gmail.com>:
>>>
>>>> Estou na live cd sim, saí do chroot e tentei o seguinte comando:
>>>> mint mint # grub-install --root-directory=/media/linux /dev/sda
>>>> grub-probe: error: failed to get canonical path of `/cow'.
>>>> Installing for i386-pc platform.
>>>> grub-install.real: error: attempt to install to encrypted disk without
>>>> cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file
>>>> `/etc/default/grub'..
>>>>
>>>> Ou seja, deu merda, acho que nem o Windows vai iniciar depois dessa.
>>>>
>>>> Em 3 de setembro de 2017 18:46, Rodolfo <rof20...@gmail.com> escreveu:
>>>>
>>>>> Você chegou a usar um live-cd?
>>>>>
>>>>> Eu tive um problema parecido, entrei pelo live-cd(ou pelo cd de
>>>>> instalação do Debian, pois tem uma parte que consigo acessar a instalação
>>>>> que tinha pelo terminal) e reinstalei o grub, isso mesmo, reinstalei, não
>>>>> fiz nenhum comando, só fiz reinstalar.
>>>>>
>>>>>
>>>>>
>>>>> 2017-09-03 14:29 GMT-04:00 Luiz Carlos <lc94...@gmail.com>:
>>>>>
>>>>>> Eu desabilitei o fastboot do windows 10, mas mando esses comandos e
>>>>>> simplesmente dá erro:
>>>>>> mint@mint ~ $ sudo su
>>>>>> mint mint # modprobe dm-crypt
>>>>>> mint mint # cryptsetup luksOpen /dev/sda5 linux
>>>>>> Enter passphrase for /dev/sda5:
>>>>>> mint mint # mkdir /media/linux
>>>>>> mint mint # mount /dev/lvmc/root /media/linux/
>>>>>> mint mint # chroot /media/linux /bin/bash
>>>>>> root@mint:/# mount /dev/sda2 /boot
>>>>>> mount: /boot: mount failed: Unknown error -1
>>>>>>
>>>>>> Se não consigo montar a droga da /boot não vou conseguir instalar o
>>>>>> grub.
>>>>>>
>>>>>> 2017-09-03 17:53 GMT+00:00 Rodolfo <rof20...@gmail.com>:
>>>>>>
>>>>>>> Tentou bootar via live-cd?
>>>>>>>
>>>>>>> 2017-09-03 12:17 GMT-04:00 Luiz Carlos <lc94...@gmail.com>:
>>>>>>>
>>>>>>>> Que desgraça de vida, horas no google pesquisando e não consigo
>>>>>>>> resolver porra nenhuma, maldita hora que fui inventar de instalar 
>>>>>>>> Windows
>>>>>>>> 10 e achar que ia conseguir recuperar o Grub.
>>>>>>>>
>>>>>>>> 2017-09-03 14:19 GMT+00:00 Luiz Carlos <lc94...@gmail.com>:
>>>>>>>>
>>>>>>>>> Estou até agora tentando, tentei o comando:
>>>>>>>>> # grub-install --boot-directory=/boot /dev/sda
>>>>>>>>> Installing for i386-pc platform.
>>>>>>>>> grub-install.real: warning: Sector 32 is already in use by the
>>>>>>>>> program `FlexNet'; avoiding it.  This software may cause boot or other
>>>>>>>>> problems in future.  Please ask its authors not to store data in the 
>>>>>>>>> boot
>>>>>>>>> track.
>>>>>>>>> Installation finished. No error reported.
>>>>>>>>> mint mint # grub-install --boot-directory=/boot /dev/sda2
>>>>>>>>> Installing for i386-pc platform.
>>>>>>>>> grub-install.real: warning: File system `ntfs' doesn't support
>>>>>>>>> embedding.
>>>>>>>>> grub-install.real: warning: Embedding is not possible.  GRUB can
>>>>>>>>> only be installed in this setup by using blocklists.  However, 
>>>>>>>>> blocklists
>>>>>>>>> are UNRELIABLE and their use is discouraged..
>>>>>>>>> grub-install.real: error: will not proceed with blocklists.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Em 3 de setembro de 2017 06:03, Luiz Carlos <lc94...@gmail.com>
>>>>>>>>> escreveu:
>>>>>>>>>
>>>>>>>>>> Olá amigos, estou em desespero, agora mesmo estou numa live cd
>>>>>>>>>> tentando recuperar o grub, eu havia instalado o WIndows 10, estou 
>>>>>>>>>> com o
>>>>>>>>>> Debian criptografado, tentei recuperar com esses seguintes comandos:
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> # modprobe dm-crypt
>>>>>>>>>> # cryptsetup luksOpen /dev/sda5 linux
>>>>>>>>>> # mkdir /media/linux
>>>>>>>>>> # mount /dev/lvmc/root /media/linux/
>>>>>>>>>> # chroot /media/linux /bin/bash
>>>>>>>>>>
>>>>>>>>>> Dai quando mando # grub-install /dev/sda
>>>>>>>>>>
>>>>>>>>>> Aparece: /dev/sda: Not found or not a block device.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Eu não sei mais o que faço, aqui na live CD eu consigo ver minhas
>>>>>>>>>> partições e tudo mais.
>>>>>>>>>>
>>>>>>>>>> Meu Debian é de 64 bits.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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