pertinent log messages:
```
883s Get:204 http://ftpmaster.internal/ubuntu noble-proposed/universe armhf xvfb armhf 2:21.1.11-2ubuntu2 [738 kB]
935s autopkgtest: WARNING: apt failed to download packages, retrying in 10s...
954s E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 763 (apt-get)
954s E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
955s autopkgtest: WARNING: Test dependencies are unsatisfiable - calling apt install on test deps directly for further data about failing dependencies in test logs
957s Reading package lists...
958s Building dependency tree...
```
It perhaps looks like in setup-testbed, whilst sleeping before a retry, another process starts an apt-get command which causes the script to fail after the sleep. Or something along those lines.
logfile: /objectstorage. prodstack5. canonical. com/swift/ v1/AUTH_ 0f9aae918d5b474 4bf7b827671c868 42/autopkgtest- noble/noble/ armhf/b/ balsa/20240404_ 081820_ ad372@/ log.gz
https:/
pertinent log messages: ftpmaster. internal/ ubuntu noble-proposed/ universe armhf xvfb armhf 2:21.1.11-2ubuntu2 [738 kB] dpkg/lock- frontend. It is held by process 763 (apt-get) dpkg/lock- frontend) , is another process using it?
```
883s Get:204 http://
935s autopkgtest: WARNING: apt failed to download packages, retrying in 10s...
954s E: Could not get lock /var/lib/
954s E: Unable to acquire the dpkg frontend lock (/var/lib/
955s autopkgtest: WARNING: Test dependencies are unsatisfiable - calling apt install on test deps directly for further data about failing dependencies in test logs
957s Reading package lists...
958s Building dependency tree...
```
It perhaps looks like in setup-testbed, whilst sleeping before a retry, another process starts an apt-get command which causes the script to fail after the sleep. Or something along those lines.