I encountered something very similar to this issue (maybe even this issue?) when my docker containers could not start (using snap on Ubuntu 20.04.3 LTS under VirtualBox with a Windows 10 host). Similar to others, `sudo apt install libblockdev-mdraid2` seems to have fixed it.
In case these log lines are useful context, they came from `sudo grep fail /var/log/syslog` (just trying to filter out some of the noise and I suspect that the devmapper/containerd/cni bits are not directly related): Nov 4 05:22:48 docker kernel: [ 0.305507] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. Nov 4 05:22:48 docker systemd[1]: Starting GRUB failed boot detection... Nov 4 05:22:48 docker systemd[1]: Finished GRUB failed boot detection. Nov 4 05:22:48 docker udisksd[731]: failed to load module mdraid: libbd_mdraid.so.2: cannot open shared object file: No such file or directory Nov 4 05:22:48 docker containerd[733]: time="2021-11-04T05:22:48.627329367Z" level=warning msg="failed to load plugin io.containerd.snapshotter.v1.devmapper" error="devmapper not configured" Nov 4 05:22:48 docker containerd[733]: time="2021-11-04T05:22:48.635107136Z" level=error msg="failed to load cni during init, please check CRI plugin status before setting up network for pods" error="cni config load failed: no network config found in /etc/cni/net.d: cni plugin not initialized: failed to load cni config" Nov 4 05:22:49 docker docker.dockerd[719]: snap-update-ns failed with code 1 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to udisks2 in Ubuntu. https://bugs.launchpad.net/bugs/1811724 Title: libbd_mdraid.so.2: cannot open shared object file Status in udisks2 package in Ubuntu: Confirmed Bug description: Had some (probably unrelated?) trouble typing input into login console, and went looking through /var/log/syslog : found Jan 14 21:10:21 vps39184 udisksd[611]: udisks daemon version 2.8.1 starting Jan 14 21:10:22 vps39184 udisksd[611]: failed to load module mdraid: libbd_mdraid.so.2: cannot open shared object file: No such file or directory Jan 14 21:10:22 vps39184 udisksd[611]: Failed to load the 'mdraid' libblockdev plugin Seems to give this warning every time I boot. udisks2: Installed: 2.8.1-3 Candidate: 2.8.1-3 ubuntu: 19.04 disco ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: udisks2 2.8.1-3 ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12 Uname: Linux 4.18.0-11-generic x86_64 ApportVersion: 2.20.10-0ubuntu18 Architecture: amd64 CustomUdevRuleFiles: 80-net-setup-link.rules Date: Mon Jan 14 21:31:52 2019 Lsusb: Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: Red Hat KVM ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: root=/dev/vda1 ro vga16fb.modeset=0 quiet splash SourcePackage: udisks2 UpgradeStatus: Upgraded to disco on 2018-11-23 (52 days ago) dmi.bios.date: 01/01/2007 dmi.bios.vendor: Seabios dmi.bios.version: 0.5.1 dmi.chassis.type: 1 dmi.chassis.vendor: Red Hat dmi.modalias: dmi:bvnSeabios:bvr0.5.1:bd01/01/2007:svnRedHat:pnKVM:pvrRHEL6.6.0PC:cvnRedHat:ct1:cvr: dmi.product.family: Red Hat Enterprise Linux dmi.product.name: KVM dmi.product.version: RHEL 6.6.0 PC dmi.sys.vendor: Red Hat To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udisks2/+bug/1811724/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp