I've just figured out what the issue is here - this device has a
debugging endpoint built into the firmware which is indicated in PCR7
7a62bd67b2cc295976651b354468c0047f8d1547d25056ded5952aaf5991762a3
EV_EFI_ACTION UEFI Debug Mode
This causes us to silently mis-predict the PCR7 value today.
Like Mate suggested, I suspect this is a case of there either being
additional load events in PCR4 when running the initial install,
resulting in an invalid PCR policy being created, or a case of us
creating a valid PCR policy but there being additional load events in
PCR4 when trying to boot the i
** Attachment added: "binary_bios_measurements-after-reboot"
https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2107457/+attachment/5872331/+files/binary_bios_measurements-after-reboot
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** Attachment added: "490995999_685386237521061_4162562558058417091_n.jpg"
https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2107457/+attachment/5872332/+files/490995999_685386237521061_4162562558058417091_n.jpg
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** Attachment added: "490992766_1361809688361599_7545049647696778749_n.jpg"
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** Attachment added: "binary_bios_measurements-live-installer"
https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2107457/+attachment/5872330/+files/binary_bios_measurements-live-installer
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Hello Mate, hello Chris,
I did another install and tried booting the target system from the exact
same menu but it still asked me for the recovery key.
Quickly after powering on the laptop, I hit F12 - "One-Time Boot
Settings" then select the USB media if I want to boot the installer - or
select
Yes, if you could boot the ISO exactly how you booted it to create the
install and then copy /sys/kernel/security/tpm0/binary_bios_measurements
from the machine and either attach it to this bug or send it to me, then
that would be great.
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Can you try booting the hard-disk via the same boot menu you booted the
installer from?
Some devices unfortunately have issues where the boot UI is included in
the measurements and if you autoboot the HDD without going through the
menu it fails.
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Same result when installing 24.10 - so not a regression in that sense.
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https://bugs.launchpad.net/bugs/2107457
Title:
Can't boot after installation with TPM backed FDE on xps9320
To m
Same result if I skip the "passphrase" screen during the installation.
** Description changed:
- I tried on two different XPS 9320 units.
+ I tried installing Ubuntu 25.04 desktop with TPM backed FDE on two
+ different XPS 9320 units.
The installation seems to succeed.
However, on first
This bug has been reported on the Ubuntu ISO testing tracker.
A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/2107457
** Tags added: iso-testing
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Logs from second install
** Attachment added: "install-logs-2025-04-16.1.txz"
https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2107457/+attachment/5872093/+files/install-logs-2025-04-16.1.txz
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Logs from first install
** Attachment added: "install-logs-2025-04-16.0.txz"
https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2107457/+attachment/5872092/+files/install-logs-2025-04-16.0.txz
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