TeX Live and MacTeX ⇒ tlmgr: no texlive.tlpdb

[marto1980]

Hello!
I am running texlive-20100722. Now I need to update the pgf package. How do I do this? I see there is the automatic package manager for texlive: tlmgr. However, when I issue:

tlmgr update pgf

I get:

/usr/share/texmf/bin/tlmgr: open(/usr/share/tlpkg/texlive.tlpdb) failed: No such file or directory at /usr/lib/perl5/5.10.1/TeXLive/TLPDB.pm line 282.

I see that texlive.tlpdb is the installation’s TEX Live Package Database. However, in my installation is is not present. I guess it has to be generated somehow, but I do not know how. Any suggestions will be appreciated.

Regards,

Martin