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

[Ian Bruntlett]

Hi Robert,

On Thu, 27 Nov 2025 at 14:51, Robert Heller <heller at deepsoft.com> wrote:

> 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.
>

In my panic, I forgot to mention that when I selected either "Ubuntu" or
"ATA HDD0" that the screen would clear, then suddenly the text mode menu
re-appeared.

Apologies for the delay in replying  - I had to finish a backup elsewhere.

I've looked in the BIOS settings and I could not find an entry for Secure
Boot..I Googled for "lenovo t420 switch off secure boot" and the A.I.
response was "The Lenovo T420 does not support Secure Boot"

BW,


Ian

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