I'm customizing Calamares. In the umount.conf module there is a line

exec: "/usr/lib/calamares/postinstall.sh"

So at the end of the installation process the postinstall.sh script is launched from the umount.conf module. But in my case it is NOT launched. I even added debug information

echo paxrat >> /tmp/check

/sbin/paxrat

echo paxrat $? >> /tmp/check

and this output must be written in the check file inside the tmp directory or the /tmp/calamares-root-**** (chroot).

But the script is not launched, so nothing happens.

Help please.