18.04 installation with internet access results in GRUB minimal BASH-like interface with no boot entries

[Devin Shoemaker]

After installing Ubuntu 18.04, while the destination PC has internet access, the installation results in an unbootable state where you cannot get passed the GRUB minimal BASH-like interface. This occurs whether a "normal" or "minimal" install is selected, "download updates" or not, and "third party packages" or not. However, if all internet access is removed (no WiFi or ethernet) then the installer works, and I an boot into Ubuntu. I suspect that the installer downloads updates for Ubiquity or GRUB if possible, but I am not for sure. There are a number of people reporting this issue since yesterday as well.

https://ubuntuforums.org/showthread.php?t=2395999
https://ubuntuforums.org/showthread.php?t=2395995
https://ubuntuforums.org/showthread.php?t=2396011
https://ubuntuforums.org/showthread.php?t=2396005
https://ubuntuforums.org/showthread.php?t=2396034

I also have a Boot-Repair BootInfo summary here: http://paste.ubuntu.com/p/PwWVWnN6FB/
And logs from a failed attempt at Boot-Repair GRUB repair: http://paste.ubuntu.com/p/XwWDxf4xt5/

[oldfred (oldfred)]

Seems related to this bug.
Ubuntu 18.10 Cosmic installed /EFI/grub
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1775743

As update during install creates /EFI/grub like in above install.
But some users manually boot into Ubuntu & update grub and it works.

manual boot:
grub> set root=(hd0,gpt8) #where gpt8 in example is ext4 partition with ubuntu.
grub> configfile /boot/grub/grub.cfg
https://ubuntuforums.org/showthread.php?t=2396045
$ sudo apt-get install grub-efi-amd64
$ sudo update-grub

or it seems Ubiquity installs a different version of grub during install than an update once booted installs?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Peter Sanchez (petersanchez)]

I have the same thing. Brand new laptop, Lenovo X1 Carbon 6th gen. I have a post with a ton of detail here:

https://ubuntuforums.org/showthread.php?t=2396050&p=13782706

For quick reference, my boot-repair log is here:

http://paste.ubuntu.com/p/3fHXHYzpQP/

Also for reference, the chatter in #ubuntu / freenode is full of people with the same issue.

[Lyndon Shi (lynshi)]

I had the same issue while setting up a dual boot with Windows 10 on an ASUS ZenBook UX430UA-DH74. After installing Ubuntu and rebooting I was presented with the grub command prompt. Removing Ubuntu and reinstalling with no internet connection fixed this bug.