tlmgr update texhash

[Karl Berry]

    - Does "tlmgr update" internally try to update the ls-R-files and fails? 
    It should inform the user about this failure!

Agreed. I thought it already did report such failures. We'll have to try
to reproduce.

    - Does "tlmgr update" not even try to update the ls-R-files

tlmgr does run mktexlsr in all needed cases, to the best of my knowledge.

Thanks much for the report. -k