No updates.  An easy workaround is to do one of:

<pre>
   fossil update --latest
   fossil update trunk
   fossil update <i>version-number</i>
</pre>

Instead of just:

<pre>
   fossil update
</pre>

The problem is here that fossil is having trouble figuring out what version
it needs to update to.  If you give it a hint, it will normally keep going
without trouble.

It would help to have a reproducible test case.