[Ubuntu] ubuntu vim error when editing: option 'omnifunc' is not set

The reason for this error is that i am editing a html file, and it seems that gvim does not konw how to handle it.

At last i found this solution. Add the code to the /etc/vim/gvimrc

filetype plugin indent on
autocmd FileType ruby,eruby set omnifunc=rubycomplete#Complete
autocmd FileType python set omnifunc=pythoncomplete#Complete
autocmd FileType javascript set omnifunc=javascriptcomplete#CompleteJS
autocmd FileType html set omnifunc=htmlcomplete#CompleteTags
autocmd FileType css set omnifunc=csscomplete#CompleteCSS
autocmd FileType xml set omnifunc=xmlcomplete#CompleteTags
autocmd FileType java set omnifunc=javacomplete#Complete
if has("autocmd") && exists("+omnifunc")
     autocmd Filetype *
   \ if &omnifunc == "" |
   \   setlocal omnifunc=syntaxcomplete#Complete |
   \ endif
endif
let g:rubycomplete_buffer_loading = 1
let g:rubycomplete_classes_in_global = 1
"let g:rubycomplete_rails = 1