This bug report seems a duplicate of the bug #1495200.
The 1495200 is already fixed and we have verified that this doesn't happen for us any more after upgrading to 15.04.4 which includes the fix for the #1495200.
This bug report seems a duplicate of the bug #1495200.
The 1495200 is already fixed and we have verified that this doesn't happen for us any more after upgrading to 15.04.4 which includes the fix for the #1495200.