无法安装覆盖：没有此类设备 storage-driver=overlay2

Question

我尝试在 Ubuntu 20.04.3 LTS (Focal Fossa) 上安装 docker-ce，但出现了 Overlay2 错误。根据文档，它可以工作，因为我有内核 4.4.182-mainline-rev1。

INFO[2021-11-03T15:02:55.375424503+01:00] Starting up                                  
INFO[2021-11-03T15:02:55.376873274+01:00] detected 127.0.0.53 nameserver, assuming systemd-resolved, so using resolv.conf: /run/systemd/resolve/resolv.conf 
INFO[2021-11-03T15:02:55.380156220+01:00] parsed scheme: "unix"                         module=grpc
INFO[2021-11-03T15:02:55.380343883+01:00] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2021-11-03T15:02:55.380511607+01:00] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}  module=grpc
INFO[2021-11-03T15:02:55.380746348+01:00] ClientConn switching balancer to "pick_first"  module=grpc
INFO[2021-11-03T15:02:55.386164293+01:00] parsed scheme: "unix"                         module=grpc
INFO[2021-11-03T15:02:55.386390699+01:00] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2021-11-03T15:02:55.386507127+01:00] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}  module=grpc
INFO[2021-11-03T15:02:55.386582789+01:00] ClientConn switching balancer to "pick_first"  module=grpc
ERRO[2021-11-03T15:02:55.393126880+01:00] failed to mount overlay: no such device       storage-driver=overlay2
failed to start daemon: error initializing graphdriver: driver not supported

我删掉了/var/lib/docker。

我使用以下命令创建了 /etc/docker/daemon.json：

{
 "storage-driver": "overlay2"
}

我添加DOCKER_OPTS="-s overlay2" 到/etc/default/docker.

什么都不起作用。请帮忙。