Comment 4 for bug 1889926

This is not a kernel problem. The problem is that the pigpio library is trying to mmap the GPIOs with PROT_EXEC which is a security risk. In Focal /dev is mounted with the noexec flag so that's no longer possible. They could patch the pigpio library to remove the PROT_EXEC flag from the mmap call but I don't know if the library relies on that in other places (it really shouldn't). There's probably a library in Ubuntu to access GPIOs which is really what they should use so they get support if something doesn't work. Closing as invalid as this is not a bug.