From @samlane-ma
About the raspi zram issue from Discourse - Apparently there is a package now that either is no longer part of the default install for whatever reason, or was inadvertently left out. (I read somewhere that the kernel modules package was split in two, but I don't know enough to know if this is true or not). But on a fully updated install, 5.13.0-1010, installing the package "linux-modules-extra-raspi" installed the missing zram module and also several others. Rebooted and zram works now.
So this info needs to be added to the README at a minimum
From @samlane-ma
About the raspi zram issue from Discourse - Apparently there is a package now that either is no longer part of the default install for whatever reason, or was inadvertently left out. (I read somewhere that the kernel modules package was split in two, but I don't know enough to know if this is true or not). But on a fully updated install, 5.13.0-1010, installing the package "linux-modules-extra-raspi" installed the missing zram module and also several others. Rebooted and zram works now.
So this info needs to be added to the README at a minimum