Update killed X11 and damaged Locales

[Russ Cook <russcook@mbo.net>]

I updated my pure 64 bit system (AMD64) yesterday, running combination 
of Sid and Sarge.
Afterwards, X11 will no longer start up.   The startx file is missing, 
as is /etc/X11/Xsession file.
Perl is also complaining about certain Locale variable not being 
settable, due to missing files (or something like that).  I have not 
changed my sources.list file in several months.  I'd rather not
do a complete reinstall, if this can be recovered.  How can I restore my 
X11 system (Xorg)?
What must I do to repair Locales?

Thanks in advance for any help or suggestions.