At http://www.ubuntu.com/certification/hardware/201307-13930/ the bios version it says is certified is EFI v2.31 Lenovo
But the latest UEFI version available from Lenovo's website is 2.25
How do I get the version that works?
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The certification tool gets this version from the following command:
[ -d /sys/firmware/efi ] && cat /var/log/kern.log* | grep -m 1 -o --color=never 'EFI v.*'
I have a T430S which also returns
EFI v2.31 by Lenovo.
The EFI version number that you see on the certification website (2.3.1, although that's often reported by software as 2.31) refers to the version of the EFI specification the firmware implements.