Comment # 63 on bug 1228863 from Guillermo Perez

(In reply to Alberto Planas Dominguez from comment #62)
> (In reply to Guillermo Perez from comment #61)
> 
> > ~> sdbootutil -v --ask-pin update-predictions
> > Error: Can't determine root subvolume
> 
> Do you have a default snapshot?
> 
> sudo snapper ls
> 
> This should show a list of snapshots, and one of the should be marked with
> "*". If this is not the case, somehow you system lacks of default subvolume.

No, I've got only the one reverted (marked with a - and the last one, marked
with +) No default snapshots.
BTW, after following the steps in the wiki for completely re-enroll tpm2, it
generated a new recovery key. Rebooting the PC asks for a key, the new one
doesn't seems to work, but the old one does. After running again sudo
systemd-cryptenroll now it only lists
SLOT TYPE    
   2 recovery
So it doesn't recognises tpm2.

I'm starting to think maybe the only solution is a reinstall.