If you get:
The document uses an unknown textclass "docbook-book". LyX wil not be able to format output correctly
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do "Layout-->Document" on any LyX document you have and then, in the window that will appear, check the classes available under "Class". You should see all the above classes you listed,
especially the "DocBook book (SGML)" class I use. You should see something like:
+checking for docbook class docbook-algo... yes
+checking for docbook class docbook-book... yes
+checking for docbook class docbook-chapter... yes
+checking for docbook class docbook... yes
+checking for docbook class docbook-section... yes
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If not, then somehow the reconfigure command above (see Section 4.1) did not find all your classes.
