Most users do not change boot firmware of their computers.  Trisquel is
better for their freedom and privacy than Ubuntu.

TPM is just mostly useless, it has no security issues.  There are other
worse components, like Management Engine that on all recent Intel
chipsets (optional since i965, required after GM45) uses nonfree signed
software stored in boot firmware chip, that provides AMT on (officially only)
some chipsets.

UEFI makes boot firmware more complex, it has the same freedom issues as
BIOS or other similar software.  Secure Boot makes booting free systems
harder (requiring changing some settings), restricted boot is not done
on x86.

Libreboot port needs coreboot support for a device without blobs.  No
post-GM45 Intel system will be supported, no AMD system will be
supported with graphics unless someone replaces some blobs.  See
coreboot documentation for how to port it to other devices, it needs
much experience (and is a possible way of getting such experience if you
choose an appropriate target system).

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