title: Juju commands fail - Error unable to open /tmp/juju-store-lock-3635383939333230
body: <p>I've got a little problem with Juju and I was windering if someone came accross it or know what it can be.</p>
  <p>I'm using Juju 2.8.1-focal-amd64 in association with MAAS 2.8.1 (8567-g.c4825ca06) in order to deploy an Openstack cloud.</p>
  <p>I've installed and run the Juju commands as the user root.</p>
  <p>And when I enter a Juju command I got the following message :
  ERROR cannot acquire lock file to get the current controller name: unable to open /tmp/juju-store-lock-3635383939333230: permission denied</p>
  <p>It first came when I try to bootstrap a controller :</p>
  <pre><code>09:30:56 INFO  juju.cmd supercommand.go:91 running juju [2.8.1 0 16439b3d1c528b7a0e019a16c2122ccfcf6aa41f gc go1.14.4]
  09:30:56 DEBUG juju.cmd supercommand.go:92   args: []string{&quot;/snap/juju/13324/bin/juju&quot;, &quot;bootstrap&quot;, &quot;--constraints&quot;, &quot;tags=juju&quot;, &quot;mymaas&quot;, &quot;maas-controller&quot;, &quot;--debug&quot;}
  09:30:56 DEBUG juju.cmd.juju.commands bootstrap.go:1153 authenticating with region &quot;&quot; and credential &quot;anyuser&quot; ()
  09:30:56 DEBUG juju.cmd.juju.commands bootstrap.go:1281 provider attrs: map[]
  09:30:57 INFO  cmd authkeys.go:114 Adding contents of &quot;/root/.local/share/juju/ssh/juju_id_rsa.pub&quot; to authorized-keys
  09:30:57 INFO  cmd authkeys.go:114 Adding contents of &quot;/root/.ssh/id_rsa.pub&quot; to authorized-keys
  09:30:57 DEBUG juju.cmd.juju.commands bootstrap.go:1340 preparing controller with config: map[agent-metadata-url: agent-stream:released apt-ftp-proxy: apt-http-proxy: apt-https-proxy: apt-mirror: apt-no-proxy: authorized-keys:ssh-rsa  juju-client-key
  ssh-rsa key= root@infra01
   automatically-retry-hooks:true backup-dir: cloudinit-userdata: container-image-metadata-url: container-image-stream:released container-inherit-properties: container-networking-method: default-series:bionic default-space: development:false disable-network-management:false egress-subnets: enable-os-refresh-update:true enable-os-upgrade:true fan-config: firewall-mode:instance ftp-proxy: http-proxy: https-proxy: ignore-machine-addresses:false image-metadata-url: image-stream:released juju-ftp-proxy: juju-http-proxy: juju-https-proxy: juju-no-proxy:127.0.0.1,localhost,::1 logforward-enabled:false logging-config: lxd-snap-channel:latest/stable max-action-results-age:336h max-action-results-size:5G max-status-history-age:336h max-status-history-size:5G name:controller net-bond-reconfigure-delay:17 no-proxy:127.0.0.1,localhost,::1 provisioner-harvest-mode:destroyed proxy-ssh:false resource-tags: snap-http-proxy: snap-https-proxy: snap-store-assertions: snap-store-proxy: snap-store-proxy-url: ssl-hostname-verification:true test-mode:false transmit-vendor-metrics:true type:maas update-status-hook-interval:5m uuid:528fe789-5850-4ab6-831b-1d6370fb6512]
  ERROR error reading current controller: cannot acquire lock file to get the current controller name: unable to open /tmp/juju-store-lock-3635383939333230: permission denied
  09:30:57 DEBUG cmd supercommand.go:537 error stack:
  permission denied
  /build/snapcraft-juju-03af7d/parts/juju/src/vendor/github.com/juju/mutex/mutex_flock.go:92: unable to open /tmp/juju-store-lock-3635383939333230
  /build/snapcraft-juju-03af7d/parts/juju/src/vendor/github.com/juju/mutex/mutex_flock.go:111:
  /build/snapcraft-juju-03af7d/parts/juju/src/vendor/github.com/juju/mutex/mutex_flock.go:25:
  /build/snapcraft-juju-03af7d/parts/juju/src/jujuclient/file.go:79:
  /build/snapcraft-juju-03af7d/parts/juju/src/jujuclient/file.go:104: cannot acquire lock file to get the current controller name
  /build/snapcraft-juju-03af7d/parts/juju/src/cmd/modelcmd/controller.go:129:
  /build/snapcraft-juju-03af7d/parts/juju/src/cmd/juju/commands/bootstrap.go:655: error reading current controller
  </code></pre>
  <p>I've try to change the permissions on this file (with a chmod 777) but that doesn't work.</p>
  <p>Thanks in advance :)</p>