Ubuntu STR 25.10 installs but won't boot (lenovo ThinkPad T420)

[Robert Heller]

That sounds like the *BIOS* boot menu. For some reason you have the BIOS
configured to always display *its* bootable device menu (maybe done to allow
for booting off the USB Flash drive). You need to change that BIOS setting,
but first test things by selecting the ATA HDD option. *That* should pull up
the GRUB menu (or just go ahead and boot up Ubuntu, depending on the GRUB menu
timeout value.

At Thu, 27 Nov 2025 14:32:05 +0000 "Ubuntu user technical support,? not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> Hi,
> 
> I dusted down this lenovo T420 ThinkPad and it booted into Ubuntu 24.04
> (.2, I think) and it worked fine. So I downloaded Ubuntu 25.10 and put it
> on a Ventoy stick.
> 
> I booted the T420 with the Ventoy stick and I installed 25.10 on it -
> wiping the entire drive. The install went OK and I dabbled with the system
> OK.
> 
> So I rebooted.  I got a text mode screen, blue background and white text,
> titled "Boot Menu", looking like this:-
> 
> Boot Menu
> Ubuntu
> ATAPI CD0- etc
> ATA HDD:CT1000MX5000SSD1
> PCI LAN etc
> 
> It looks like I can't even get to the GRUB screen.
> 
> Any ideas?
> 
> TIA,
> 
> 
> Ian
> 

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