"cannot create void directory" snapd error when running bluetooth/detect-output job

[pieqq]

Bug Description

Example (Ubuntu Core 18): http://10.102.156.15:8080/job/cert-presidio-interactive-strength-fs0001-kernel-beta/72/console (also see submission in C3)

11:56:42 ID: com.canonical.certification::bluetooth/detect-output
11:56:42 Category: Bluetooth tests
11:56:42 --------------------------------------------------------------------------------
11:56:42 cannot create void directory: /var/lib/snapd/void: Permission denied
11:56:42 
11:56:42 BT hardware not available
11:56:42 --------------------------------------------------------------------------------
11:56:42 Outcome: job failed

To Reproduce

Launch a test plan with the bluetooth/detect-output job.

Environment

• Ubuntu Core (seen on 18 and 20)
• Snapd 2.63 (rev 21759)
• checkbox18 4.1.0-dev25

Relevant log output

No response

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1612.

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[fernando79513]

The same issue occurs with http://10.102.156.15:8080/job/cert-denver-kdrp-hmi-10-avnet-avt-iiotg20-kernel-latest-beta/54/console (submission https://certification.canonical.com/hardware/202012-28525/submission/397839/)

Environment
Ubuntu Core 20
Snapd 2.50 (rev 11844)
checkbox20 4.1.0-dev25

In this case, the snapd version had to be reverted to be able to run the tests.