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front end - Mathematica notebook autocompletion completely disappears


Just as what is described in the title, the notebook behaves as if it were originally designed to not have the autocompletion functionality at all. Neither Ctrl+K nor F2 works. Furthermore, reinstalling Mathematica does not help, either.


What measures could be taken that possibly help to recover the autocompletion functionality? I suspect that some items in "Option Inspector" might be responsible but I can not find them.



It seems that quite a few people encounter this problem recently.



But, for now, the "$UserBaseDirectory deletion / renaming methods" cannot thoroughly settle this issue, can they?



Answer



PacletUpdate["EntityFramework"]


should resolve the issue at this point.


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