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My emacs is failed to start after debian update. 
Debugger entered--Lisp error: (error "Cannot open doc string file \"/usr/share/emacs/24.1.50/etc/DOC-24.1.50.1\"")
I've reinstalled package without success. Reason of this is related to the incorrect doc file version for emacs (emacs is 24.1.50.1 but doc file has .2 at the end)
Fix is really simple : 
cd /usr/share/emacs/24.1.50/etc
ln -s DOC-24.1.50.2  DOC-24.1.50.1
debian:/usr/share/emacs/24.1.50/etc# ls -la DOC*
lrwxrwxrwx 1 root root 13 чер  5 17:25 DOC-24.1.50.1 -> DOC-24.1.50.2
 
Emacs is OK after this.

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