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After the installation of Ubuntu, when I try to boot a black screen with a purple box appears without let me see the GRUB menu. Then the screen becomes black and Ubuntu starts booting. Ubuntu is the only OS installed, but it's quite annoying as I can't see the bootloader options. What could be wrong?

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  • Could you clarify whether Ubuntu boots finally or the boot fails? – Thomas Hughes May 27 '14 at 1:34
  • It is also worth noting that after you exit this menu you also have to run the command sudo update-grub – user82057 Aug 26 '14 at 12:28
  • @tia_0, if you've found an answer helpful, accept it by selecting the grey checkbox below the up- and down-vote toggles. – drs Aug 26 '14 at 12:33
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When Ubuntu is the only installed OS, the GRUB menu is automatically hidden as per default. To change this, edit your GRUB configuration using the following command:

sudo nano /etc/default/grub

Then you have to replace the following line:

GRUB_HIDDEN_TIMEOUT= ...

with this one:

GRUB_TIMEOUT=5

To learn more about the options in /etc/default/grub, run the following command to browse the GRUB info page:

info -f grub -n 'Simple configuration'
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  • @LewisMcGinley adds that "It is also worth noting that after you exit this menu you also have to run the command sudo update-grub" – drs Aug 26 '14 at 12:32

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