I slightly tweaked vsh behavior with https://chromium-review.googlesource.com/c/chromiumos/platform2/+/1332907

It's possible that's interfered with copying the package in.

I'm pretty sure it's the time sync. There's a test for the package info which runs right before the install test, and the package info one isn't failing at all...so the .deb file was copied fine.  I'm doing a CL right now to change the time sync so this isn't a problem anymore.

To add more context to that...when we did the clock sync test; it was setting it to the epoch and then back to the current time. That was triggering the apt-daily activity which then was somehow interfering with the install (I would have expected an error with the dpkg lock; but maybe the 'could not find package(s)' relates to that somehow).  The fix will be to just set the clock back one hour and then sync it and verify it's at the current time. Based on the log, that won't cause anything with apt-daily to fire during the testing.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/tast-tests/+/f4f6bbe60eeb64e9d9af9302bc3e5f76e04ba3e5

commit f4f6bbe60eeb64e9d9af9302bc3e5f76e04ba3e5
Author: Jeffrey Kardatzke <jkardatzke@google.com>
Date: Wed Nov 28 03:14:17 2018

tast-tests: Fix test failure with installing packages

There was a new failure where installing from a .deb file would fail a
lot of the time. This was because we added a time sync test which was
setting the clock backwards to the epoch and then to the current time.
That would then end up firing the apt-daily task which would interfere
with the package install. The fix for this is to just disable the
apt-daily and apt-daily-upgrade systemd timers during testing so that we
don't get conflicts from those.

BUG= chromium:908527 
TEST=tast run vm.CrostiniStartEverything

Change-Id: I942a2ee7524c789791a3c0e75eddc1e238e03bc4
Reviewed-on: https://chromium-review.googlesource.com/1351672
Commit-Ready: Jeffrey Kardatzke <jkardatzke@google.com>
Tested-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>

[modify] https://crrev.com/f4f6bbe60eeb64e9d9af9302bc3e5f76e04ba3e5/src/chromiumos/tast/local/bundles/cros/vm/crostini_start_everything.go