You had a setup with multiple root filesystems which each had canmount=on and mountpoint=/. So they both tried to automatically mount at /. (When booting in the root-on-ZFS config, one was already mounted as your root filesystem.) ZFS, unlike other Linux filesystems, refuses to mount over non-empty directories. Thus, mounting over / fails. Thus `zfs mount -a` would fail, which was the underlying command for zfs- mount.service. As a result of the mount failing, you got into a state where some datasets mounted, but not all of them. As a result of this, you had empty directories for some mountpoints in the wrong filesystems. As a result, those empty directories continued to break `zfs mount -a`.
In your case, it's likely that the relevant directory was /vms/vms. This was preventing you from mounting the vms dataset at /vms. To be absolutely clear, this was because /vms was non-empty, because it contained /vms/vms. You first fixed the underlying issue with the root filesystems by setting canmount=noauto on both of them. That still left the second problem. Once you `rmdir`ed the directory(ies) that were in the way, mounting works correctly. Separately from the issues above, it's best practice to NOT store anything in the root dataset on a pool (the dataset with the same name as the pool, in this case "vms"), because that dataset can never be renamed. If you're not actually using the "vms" dataset itself, I suggest the following: zfs unmount vms/vms rmdir /vms/vms # this rmdir not required, but I like to cleanup completely zfs unmount vms zfs set canmount=off vms zfs mount vms/vms -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1846424 Title: 19.10 ZFS Update failed on 2019-10-02 Status in zfs-linux package in Ubuntu: Invalid Bug description: On all my systems the update from zfs-initrams_0.8.1-1ubuntu12_amd64.deb failed the same is true for zfs-zed and zfsutils-linux. The system still runs on 0.8.1-1ubuntu11_amd64. The first error message was about a failing mount and at the end it announced that all 3 modules were not updated. I have the error on Xubuntu 19.10, Ubuntu Mate 19.10 on my laptop i5-2520M and in a VBox VM on a Ryzen 3 2200G with Ubuntu 19.10. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1846424/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
