There are more reports of users hitting that issue on https://discourse.ubuntu.com/t/tpm-backed-full-disk-encryption-is-coming-to-ubuntu-discussion , it also seems not easy to go back to a working apt
There are more reports of users hitting that issue on https:/ /discourse. ubuntu. com/t/tpm- backed- full-disk- encryption- is-coming- to-ubuntu- discussion , it also seems not easy to go back to a working apt