Comment 5 for bug 1825587

Fritz, the reason you see quick fixes is because LXQt is actively being
developed, unlike LXDE, which hasn't been in a long, long time. There's
a reason why every new release of Lubuntu was essentially a maintenance
release.

Anyways, it sounds like the consensus is that though this has a
relatively small impact, it's ugly and offensive enough that we should
do a SRU. That means that we should see it in Disco relatively soon.
Part of that process will involve some editing of this bug report. Then
when the fix is uploaded, it will go to "Fix Committed." Finally, when
the package with the fix is available in the repositories, it will go to
"Fix Released." At this point, running an update on libfm-qt and
pcmanfm-qt (since it's built based on libfm-qt) will resolve the issue.

Until then, you cannot really do anything with the file since it doesn't
exist. The work around is in the description:
 1. Open pcmanfm-qt
 2. Go to the Desktop folder
 3. Refresh the folder (F5)
Now the errant file will not return, no matter whether or not you check
shortcuts on or off. It will return when you log in again, though.

One other thing: the issue here is a timing issue, and it will be made
worse with less resources. That means that sometimes you might have the
issue and sometimes you might not. It's bizarre. Kudos to the upstream
developers for finding it so quickly.