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Can someone explain what the following error in/var/log/syslog means? I don't know if I picked the relevant part, there is a lot more information in the log.

Feb 4 10:57:51 chriad-VirtualBox dockerd[1313]: time="2019-02-04T10:57:51.039077089+01:00" level=warning msg="grpc: addrConn.createTransport failed to connect to {unix:///run/containerd/containerd.sock 0 <nil>}. Err :connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\". Reconnecting..." module=grpc

Feb 4 10:57:51 chriad-VirtualBox dockerd[1313]: time="2019-02-04T10:57:51.039751889+01:00" level=warning msg="grpc: addrConn.createTransport failed to connect to {unix:///run/containerd/containerd.sock 0 <nil>}. Err :connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\". Reconnecting..." module=grpc

Feb 4 10:57:51 chriad-VirtualBox dockerd[1313]: time="2019-02-04T10:57:51.039822044+01:00" level=error msg="failed to get event" error="rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\"" module=libcontainerd namespace=plugins.moby

and this goes on for a long time...

What can I do to make this error go away?

uname -a
Linux chriad-VirtualBox 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29     16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux`

I use virtualbox 5.2.26.

systemctl | grep failed
● apport-autoreport.service          loaded failed failed    Process error reports when automatic reporting is enabled             
● containerd.service                 loaded failed failed    containerd container runtime                                          
● vboxadd-service.service            loaded failed failed    vboxadd-service.service

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