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I have an strange behaviour, i boot my pc, and instead of grub menu, i got a black screeen. I suppose it works well because i dont change the default option, then after 10 seconds, it boots ubuntu in graphical mode (as i wanted, instead of kernel messages in console) and i get into the login screen in graphical interface.

Some kind grub isnt displayed properly. Any ideas ?? I want my grub back again.

Boot message ( i repaired the boot with boot-repair, and i got this information): https://paste.ubuntu.com/p/MdtkrKWWpV/

Edit requested by comment:

  • No dual boot ( only ubuntu system)
  • If i press ESc then grub appears but with black and white screen not default purple ubuntu theme. Also is a kind of simple menu ( ex: without memtest option).
Eduardo Gutierrez
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  • Please edit your question and add if this is a dual boot computer? If there computer only has Ubuntu, grub should not show. If you press shift or esc (I forget which one) when there black screen shows, do you get the grub menu? – user68186 Oct 07 '20 at 19:57

1 Answers1

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On a computer with just Ubuntu installed (no other OS), GRUB elegantly hides its menu during the 10 sec timeout by default (unless you hit escape during the timeout), because in most cases, there's only one choice anyways and that way the user is less likely to be confused by the GRUB menu.

If you'd like to always see the GRUB menu, change the default:

sudo nano /etc/default/grub

(replace nano with gedit if you'd like a GUI, or with vi if you can remember how to use that). Look for:

 GRUB_TIMEOUT_STYLE=hidden

and change that into

 GRUB_TIMEOUT_STYLE=menu

Next, update the GRUB config in the boot area:

 sudo update-grub

You will now see the menu every time you boot. More info in the manual pages.

Adriaan
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  • Thanks it helped me, but last question, how can i going back to original theme in grub boot menu ubuntu 20.04 ??? – Eduardo Gutierrez Oct 10 '20 at 09:04
  • I'm not sure what you mean by 'original theme'? – Adriaan Oct 11 '20 at 15:18
  • As i can remember in grub i had the same background as login screen ( or similar with purple color), so was also in 18.04 ... also appered menu options like memtest that doesnt appear now...thanks – Eduardo Gutierrez Oct 12 '20 at 10:12
  • Take a look at GRUB_THEME and GFX settings in the GRUB manual – Adriaan Oct 12 '20 at 14:55
  • Should you feel your (initial) question was answered, would you please click on 'anwered' so this issue is closed? – Adriaan Oct 12 '20 at 14:56
  • Well i have looked to the link of Grub manual, but i dont know where to get and which theme is the default in ubuntu 20.04. Also i have less options than before in the menu, like memtest.... – Eduardo Gutierrez Oct 12 '20 at 16:49
  • Does this help you? I've seen in your boot-repair log that you are booting MBR (aka BIOS, not EFI). You should be able to boot memtest86+. In (U)EFI mode, memtest no longer works. – Adriaan Oct 15 '20 at 08:59
  • Yes, the GRUB menu has changed from 18.04. I suggest you ask another question, like: "How do I get 18.04 style to 20.04 GRUB?" – Adriaan Oct 15 '20 at 09:01