If you can attach /var/lib/dkms/zfs/0.8.3/build/make.log to the bug report that would be useful. I'm fairly confident that the failure to build the 20.10 zfs 0.8.x is because it not compatible with a 5.11 kernel.
If you want the lest 5.11 kernel then I suggest moving to Ubuntu 21.04 as this has a 5.11 kernel and ZFS 2.0.x that is supported on the 5.11 kernels. ** Changed in: zfs-linux (Ubuntu) Status: New => Incomplete ** Changed in: zfs-linux (Ubuntu) Importance: Undecided => Low ** Changed in: zfs-linux (Ubuntu) Assignee: (unassigned) => Colin Ian King (colin-king) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1923291 Title: package zfs-dkms (not installed) failed to install/upgrade: installed zfs-dkms package post-installation script subprocess returned error exit status 10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1923291/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs