> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/generic/solution/hostagent-installation-failed-during-node-onboarding.md).

# Hostagent Installation Failed, 'Unable to lock directory /var/cache/apt/archives'

## Problem

* Hostagent installation failed with the below error.

{% tabs %}
{% tab title="None" %}

```none
Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)<br>E: Unable to lock directory /var/cache/apt/archives/<br>"}
```

{% endtab %}
{% endtabs %}

* pf9ctl logs show below messages

{% tabs %}
{% tab title="None" %}

```none
{"level":"debug","ts":"2021-04-24T22:48:42.3694Z","caller":"pmk/node.go:216","msg":"Hostagent download completed successfully"}..{"level":"debug","ts":"2021-04-24T22:48:45.8739Z","caller":"pmk/node.go:247","msg":"Ran command sudo[bash -c /tmp/installer.sh --no-proxy --skip-os-check --ntpd --no-project --controller=1618992570-18611.platform9.io --username=smeredith@capturealpha.com --password=Crytime1234!!]"}.{"level":"debug","ts":"2021-04-24T22:48:45.8739Z","caller":"pmk/node.go:247","msg":"stdout:<br>Extracting Platform9 installer<br>No TTY available. Skipping all prompts...<br>No TTY available. Skipping all prompts...<br>Skipping operating system compatibility questions<br>Reading package lists...<br>Building dependency tree...<br>Reading state information...<br>tp is already the newest version (1:4.2.8p10+dfsg-5ubuntu7.3).<br>Error: Could not install the ntp package<br>stderr:E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)<br>E: Unable to lock directory /var/cache/apt/archives/<br>"}.{"level":"debug","ts":"2021-04-24T22:48:45.874Z","caller":"pmk/node.go:48","msg":"Sending Segment Event: Prep-node : ERROR"}
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed Kubernetes - v4.0 and Higher

## Cause

Not able to get lock on /var/cache/apt/archive directory.

## Resolution

Make sure there are no apt processes running on the node that is being onboarded and then retry the *pf9ctl prep node* command.


---

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