TPM backed encryption on Dell Precision 5490 results in asking for Recovery Key endlessly.

There are a number of issues here. The primary one being that im asked for the recovery key after installing ubuntu 26.04 LTS.
The other issue is it seems to initiatite a reboot after some time on the recovery key screen. This would be impossible for a person with a disability to enter before the boot happens. My suggestion is drop the restarte on this screen completely and figure out whats wrong with the PCRs. I havent been able to find the specific details.

This happens consistently after numerous rounds of:
- Verifying secure boot is enabled
- Clearing the TPM
- Installing Ubuntut 26.04 LTS and enabling hardware backed (TPM) encryption.

Start by reproducing the issue on the Dell Precision 5490 using the listed secure-boot, TPM-clearing, and Ubuntu installation steps. Investigate the PCR state during the recovery-key prompt and the subsequent reboot behavior; done means identifying the cause and preventing the endless prompt and inaccessible timed restart.

Written by the indexing model from the issue text.