Flaky test: demo: `Failed to install browsers`

[willdavsmith]

Bug information

Steps to reproduce (required)

Samples functional tests

Observed behavior (required)

Tests fail:

E: Package 'libasound2' has no installation candidate
E: Package 'libicu70' has no installation candidate
E: Unable to locate package libffi7
E: Unable to locate package libx264-163
Failed to install browsers
Error: Installation process exited with code: 100

Desired behavior (required)

Tests should pass

Workaround (optional)

Re-run the tests

System information

Samples functional tests

Additional context

Example: https://github.com/radius-project/samples/actions/runs/11345583943

AB#13865