I recommend to un-duplicate these bugs, since here, the issue occurs during the non-pristine test, but the issue is with juju being unable to find /dev/vdb, while the bug #1840836 is actually a failure with non-pristine devices being detected.
I recommend to un-duplicate these bugs, since here, the issue occurs during the non-pristine test, but the issue is with juju being unable to find /dev/vdb, while the bug #1840836 is actually a failure with non-pristine devices being detected.